Need Help with Sponsored Post Guidelines

Hi Y'all,

First, if this is the wrong place to post this question, please forive me and let me know where it should be posted for future reference. Thanks!

I started an Amazon Affiliate site a couple months ago and it's beginning to get some traction.
SEO only no backlinking or anything like that yet, just good outbound liking and interlinking. It's getting visits every day and aboyt $25 a month in income so far. So I think I'm on the right track so far and am working on more content as you read this.

I am getting emails from folk with related products that are a perfect match for this niche, wanting to give me more info about their products and inviting to visit and review. Im not in a position to go visit anyone at the present moment (as they are in Europe and I'm in between Canada and US a good bit) and I don't think that just reviewing thier product on my site would be the way to go yet as they don't have affiliate programs and I can't see taking the time to write content for no return even if the product is great. Am I being unreasonable?

My thought at the moment is to either offer them advertising space on a price per month basis with some form of contract with invoicing/payment thru paypal or stripe OR to offer them a sponsored post so that if they take the time to write the content (of course I could edit somewhat) with images, etc and charge them for having it posted on my site.

The problem is - I don't know how to figure out what each option would be worth, what is a reasonable amount to charge or what contract points/guidelines I should use.

I am sure there are tons of members here on BHW that do the above on a routin basis and I could really use a few practical pointers.

Thanks In Advance Y'all!

The question to ask is how much value will they gain by being featured on your site. How much is a lead, a sale, or a visitor their site worth. How much will they profit? It may be difficult to know. But I would charge them much less than that. It's really difficult to know how much to charge someone without knowing how well your site will convert for the customer. You you are going to have to make an educated guess.