Try Clickbank to get a good start on things while you are building your own list.

Depends on many things like
-The purpose and quality of your products
-Your target market
-Commissions of similar products like yours
-How much effort you put into finding affiliates

In the internet marketing niche many marketers have a front-end offer they offer with 75-100% commissions just to get more buyers in the sales funnel.

For your first product expect to be 100% profit on front End to your affiliate and 50% back end split.

If by splitting the sales you mean that he will promote your product as affiliate and you will give him 50 percent comission on each sale, when it's totally fine and even a good deal for you.

But if you mean that he will become your partner and will get 50 percent of every sale from now on, when you should consider seriously if it really worth it. I mean: if his only advantage is by sending your offer to his list, when it's not such a good deal...

50/50 is what I do, but I see more and more paying 100%, I get away with 50% will see how long I'm geting turned down more now for the standard 50%

50/50 is the best way to go. I don't like giving up 100%