Is this router capable of being a VPN client. I need to connect to my home network. But im missing a PPP Menu where i could setup a new OVPN or L2TP client to connect to my other RB.

Or is there another way to configure it as a client?

Install ppp package.

sorry im a total noob how is that done via terminal or?

Download all packages zip for mipsbe, unzip, drag and drop ppp package to winbox and reboot router afterwards.