Home Server Help (Ubuntu)

Hello guys,

I need help

So heres my situation

I have a router with internet and alot of connected ethernets

and I have a router that is not being used.

I tried setting up a server on my Ubuntu laptop using my main router and because of the ethernets it was extremely slow.

Im thinking of using the spare router for the server but then that would cut me off from the internet so I was thinking if there is a way where I can use my wifi for all my stuff and then use the ethernet(with spare router) for my server. Thanks.

The server guide I used is http://lifehacker.com/5919558/turn-an-old-computer-into-a-networked-backup-streaming-or-torrenting-machine-with-ubuntu

Thank you.