Two Networks One Computer

I want to have one computer access two networks through two NIC cards, one wired; the other wireless. I want one to be for internet, and the other to access other computers. I am severely computer illiterate. Can anyone plz explain to me, like you would a 9 year old, how to accomplish this?

(I want to connect my ipad to a different network than the one for internet. I have a splash top app for ipad that streams the desktop to it. It needs to be through another router than the one I use for internet because the network where I live is interfering with the app)

- THANK you so much for help
 
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