help managing the IPs

I have install an esxi and is talking like direct to the internet.

I have 5 vms. I have setup the 4 first vms with manually add the static ip (public ip) ,the subnet, the dns, and the getaway.

But I can’t setup the last vm because they have give me only 4 IPs.

The problem here is that the 4 vms is:

1) ESXI ip

2) Mail server

3) Vpn server

4) ftp-data and temp desktop

The 5) is windows 7 desktop pc

I know that the mail,vpn,ftp-rds  vms need a dedicated ip for 443 port

I think the esxi need an ip as well

And I don’t know how to put the windows7 machine to the internet (for remote desktop)

Any help???

Thank I am little new to this as is the first time to setup an esxi directly to the internet without local network.