thanks you Miguel for your help.
But I am confusing and I don't know exactly how to do this ?
Could you tell me if this is the suitable standard I have to consider: http://docs.oasis-open.org/tosca/tosca-nfv/v1.0/tosca-nfv-v1.0.html ?
Is it possible to share a .yaml example I can follow to correctly write mine ?
This is the new .yaml file.

tosca_definitions_version: tosca_simple_profile_for_nfv_1_0_0
description: This is a basic example for test
topology_template:

  inputs:
    network_name:
      type: string
      default: admin_internal_net
    odl:
      type: string
      default: 157.159.233.40:8181


  node_templates:

    VDU1:
      type: tosca.nodes.nfv.VDU
      capabilities:
        # Host container properties
        host:
         properties:
           num_cpus: 2
           disk_size: 10 GB
           mem_size: 512 MB
        # Guest Operating System properties
        os:
          properties:
            # host Operating System image properties
            architecture: x86_64
            type: sfc_client
            distribution: ubuntu
            version: 14.04


    VDU2:
      type: tosca.nodes.nfv.VDU
      capabilities:
        # Host container properties
        host:
         properties:
           num_cpus: 2
           disk_size: 10 GB
           mem_size: 512 MB
        # Guest Operating System properties
        os:
          properties:
            # host Operating System image properties
            architecture: x86_64
            type: sfc_client
            distribution: ubuntu
            version: 14.04
            
    VDU3:
      type: tosca.nodes.nfv.VDU
      capabilities:
        # Host container properties
        host:
         properties:
           num_cpus: 2
           disk_size: 10 GB
           mem_size: 512 MB
        # Guest Operating System properties
        os:
          properties:
            # host Operating System image properties
            architecture: x86_64
            type: sfc_client
            distribution: ubuntu
            version: 14.04

    my_network:
      type: tosca.nodes.network.Network
      properties:
        network_name: { get_input: network_name }

    my_port1:
      type: tosca.nodes.network.Port
      requirements:
        - binding:
            node: VDU1
        - link:
            node: my_network

    my_port2:
      type: tosca.nodes.network.Port
      requirements:
        - binding:
            node: VDU2
        - link:
            node: my_network

    my_port3:
      type: tosca.nodes.network.Port
      requirements:
        - binding:
            node: VDU3
        - link:
            node: my_network
            
    VNF1:
      type: tosca.nodes.nfv.VNF
      properties:
      attributes:
        type: dpi
        address: 10.100.0.105
        port: 40000
        nsh_aware: true 
      requirements:
        - host: VDU1

    CP11:          #endpoints of VNF1 linked to VL1
      type: tosca.nodes.nfv.VduCpd
      properties:
      attributes:
        IP_address: 10.100.0.105
        interface: ens3
        port: 30000
      requirements:
        - virtualBinding: VNF1
        - virtualLink: VL1
      capabilities: tosca.capabilities.nfv.Forwarder

    VNF2:
      type: tosca.nodes.nfv.VNF
      properties:
      attributes:
        type: firewall
        address: 10.100.0.106
        port: 40000
        nsh_aware: true
      requirements:
        - host: VDU2


    CP21:          #endpoints of VNF2 linked to VL1
      type: tosca.nodes.nfv.VduCpd
      properties:
      attributes:
        IP_address: 10.100.0.106
        interface: ens3
        port: 30000
      requirements:
        - virtualBinding: VNF2
        - virtualLink: VL1
      capabilities: tosca.capabilities.nfv.Forwarder

    VNF3:
      type: tosca.nodes.nfv.VNF
      properties:
      attributes:
        type: napt44
        address: 10.100.0.107
        port: 40000
        nsh_aware: true
      requirements:
        - host: VDU3


    CP31:          #endpoints of VNF3 linked to VL2
      type: tosca.nodes.nfv.VduCpd
      properties:
      attributes:
        IP_address: 10.100.0.107
        port: 30000
        interface: ens3
      requirements:
        - virtualBinding: VNF3
        - virtualLink: VL1
      capabilities: tosca.capabilities.nfv.Forwarder

    VL1:
      type: tosca.nodes.nfv.VL
      properties:
        vendor: HP
      attributes:
        type: ip
        transport_type: vxlan-gpe
    


    Forwarding_path1:
      type: tosca.nodes.nfv.FP
      description: the path (CP11->CP21->CP31)
      properties:
        policy:
      requirements:
        - forwarder: CP11
        - forwarder: CP21
        - forwarder: CP31

  groups:
    VNF_FG1:
      type: tosca.groups.nfv.VNFFG
      description: VNF forwarding graph
      properties:
        vendor:
        version:
        connection_point: [ CP11, CP21, CP31 ]
        dependent_virtual_link: [ VL1 ]
        constituent_vnfs: [ VNF1, VNF2, VNF3 ]
      members: [ Forwarding_path1 ]

  outputs:
    vnf1_ip:
      description: The private IP address of the VNF container1.
      value: { get_attribute: [VDU1, private_address] }
    vnf2_ip:
      description: The private IP address of the VNF container2.
      value: { get_attribute: [VDU2, private_address] }
    vnf3_ip:
      description: The private IP address of the VNF container3.
      value: { get_attribute: [VDU3, private_address] }




Thanks in advance.
Best regards.