Actually, there are sites like this online right now, and if you are willing to create a new one, there are to many competitors and you wont have to much traffic.
Just google it and there you will find sites like this one.
By the way, i dont know why people make bitcoin to look difficult, just create a wallet and start sending and receiving money, that is it, why making it so complicated?
Thanks for the answers guys.
Well, I have not seen anything that lets you accept multiple crypto. Bitcoin yes - there are a lot of merchants.
Also, does exchanges like bitrex let your accept crypto on your web & convert to fiat? I guess no.