Hi, I am trying to set up to use both OpenVPN and PPTP on the same server (a VPS). Can anyone help with a good guide? Thanks.

There are many good guides, and you can easily find them with a Google search for "how to setup openvpn and pptp in linux". You don't say what version/distro of Linux, or what you have personally done/tried so far, but this is ONE hit from the over 400,000:
http://www.earthvpn.com/how-to-confi...-ubuntu-linux/

...as well as from the openvpn documentation. Did you look there?
https://openvpn.net/index.php/access-server/docs.html

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Thanks, I have looked around a bit and devided that OpenVPN would be the best choice.

I can connect perfectly fine to the server using the OpenVPN client for Windows. But when trying to configure my DD-WRT flashed router (Linksys EA2700) with Firmware: DD-WRT v24-sp2 (05/28/15) giga, I am lost. I have installed and configured my OpenVPN server as outlined here:

https://www.digitalocean.com/communi...n-ubuntu-14-04

Have looked around, and tried several different way to connect. Either the router freezes up or the router is connected the Internet but not using OpenVPN on my server. I can see this when looking the public IP used.

Would really appreciate advice on how to correctly configure OpenVPN on this DD-WRT router.

Just buy and install as APP
https://www.vultr.com/apps/openvpn?ref=6859343