What is the best CPA product?

Actually, I was referring to my 1-on-1 coaching. The free training is available.

But back to the topic... I believe that if you want to put a lot of focus on list building, having your own product is a smart decision. Being just an affiliate is very "practical", you just pick an offer and set up a campaign, there is no product creation involved. However, after a few years in this industry and lot's of different experiences, one thing I understood is that list building is way more effective (and profitable) when you can do it around your own product(s).

Of course, affiliate promotions will always be an important part of the process, but building a list means bulding relationships and, ultimatey, building a brand. That said, it seems to me that doing it around your own products makes more sense and can bring more money, since people following you will be always eager for your advice. Although people will trust you and will consider buying the things you promote, bulding a brand just to tell people to buy from other brands doesn't sound like a wise plan. List building is expensive, getting people to follow you and read your messages isn't a simple and/or fast process, so monetizing your list with your own products becomes important at a certain point.

That's just the way I see list building, so it's based on my experiences and shouldn't be taken as a hard rule. But, since you're asking for advice and I seem to be the person trying to provide you with that, I suggest you to think about this possibility and build your "structure" around your own brand and product, and just then bring affiliate promotions to the game.

Now, based on the "book" I just wrote above, let em give you some suggestions for products and people to learn from.

Once more, I'll start with my friend Kenster. You may think that I am associated with him in any way, but, no, I am not! I just recommend his trainings because I really like his advice. Anyway, his last training called The IM System is extremely helpful for people doing what I suggested above. It's not cheap or super fast to implement, but it's solid and provides people with great advice. Another person who may help you is Igor Kheyfets. His materials are more focused on list building and, if you already have good knowledge about it, they may be not very impressive for you (great advice for beginners and intermediate marketers, though). However, I recently saw some materials from him (not sure on how or where, my assistant is always buying products and she lets me know when she finds something cool) about bulding effective funnels that had killer information. I believe that if you make some research you may find that information.

I hope it helps you!