Affiliate Marketing/Tracking Question from a Product Seller

Hey Warriors!
As you can tell, I'm new here and new to selling digital products. After months of research, I'm starting to realize how much I DON'T know!

I've developed a great info product for small business owners (brick and mortar - not online businesses). I have the program, the site/platform, and everything just about ready to go. Now I just need to get it to people. I have to bootstrap my launch, due to limited resources. I'm planning to dabble in CPC, but I think affiliates are the way to go because: A. I only pay if they sell; B. they should have discernible audiences, which makes them more effective than CPC.

Question 1: Contacting Affiliates
I plan to contact potential affiliates directly via email or their own web forms, give them a sample of my product, invite them to review it, and then invite them to be my affiliates in exchange for a percentage of each sale. Does anyone have any thoughts on the most effective way to do that? Or is it just as simple as doing a Google search for bloggers and sending emails?

Question 2: Tracking Affiliate Sales
It's really important to me that affiliates get paid for EVERY sale they generate. I'm not sure how to track this stuff. I'd really rather not buy a service for that yet, as resources are really tight, so I've been thinking about assigning coupon codes to my affiliates. Is that an accepted way of tracking affiliate sales?

Question 3: Effect of Free Trial on Affiliate Sales Tracking 01
I have an initial free trial, after which customers are prompted to buy. I feel like this derails the coupon code method for my affiliates, as their referred customers won't have the coupon code directly in front of them when the free trial ends, and when they're prompted to pay. In other words, they don't buy immediately when they come over through the affiliate, but they first pass through a free trial. Does this present a real problem, or is it enough for my affiliates to say "keep this code for when you buy?"
Again, I really want affiliates to get every penny they earn. After all, that motivates them to sell more, and it's just the right way to do business, regardless. That said, I tend to over-engineer things.

Question 4: Affiliate Sales Tracking 02
With this setup, what's the best way to track actual purchases back to the affiliates who send the buyers to me? I know it's possible to track the number of free trial sign ups they send me pretty easily with API (though I'm not sure how to implement it yet). But I'm not sure how to then track the individuals who later pay back to their specific referring affiliates, so that the affiliates can be paid.

Question 5: How do I thank you on WarriorForum?
How do I thank you for your answers on WarriorForum? Last time I posted, I couldn't figure that out.

Thank you so much for your help! And if anyone here serves my target audience and would like to be an affiliate, please let me know. I think you'll be really pleased with the program I've put together.