Ok, I haven't made mistakes yet, since I ahven't started, but this seems as good a place as any to start tracking things.
Right now I'm wrestling with whether to use PayDotCom or PayPal Website Payments Pro.
I've also tried setting up idevaffiliate on my website, but I can't seem to get it working right. It sets up ok for the first day, but on the second day I can't log in to any of the admin accounts anymore. Very frustrating.
Ah, but now comes ThirdSphere. Lynn says much good about them ... and they seem to have an affiliate management program. Hosting is $24.95 a month, and all I'd be using them for is that program, but it's enticing to hear that they have good service and uptime, and that's important. If I push a launch a zillion people come a knocking, I want my site to be well-supported. So I'll be keeping you posted on how that all goes.
Wish me luck - I'm going to set up that ThirdSphere account now ...