RouterOS + LoadBalance + VPN

Hi guys,

I am really new using mikrotik becouse the network administrator is not longer working on my ompany and my boss put me as manager on this too, so for me is really new.

I have my external adress coming to the Mikrotik and he send it to a load balance from Tp-link.
network X.X.X.X

Mikrotik 192.168.3.1

TP-LINK 192.168.3.124
192.168.0.1 (internal)

FileServer Windows Server 2008
192.168.0.201

I tried do configure a VPN to access my server but no success. On the server is all set, i tried an internal VPN conection and it goes fine.

I never worked with a mikrotik routeros before, so all for me is really new.
What configuration should i do on mikrotik to configure a VPN to my server from an external conection?

I would really apreciate any help.

Regards.