Question: Will there by any limitations on how many products will be listed / can be listed on our website?
I don't think so
Are the products automatically uploaded from Amazon to our site?
No, you need to do it manually or You can use few plugins which imports products from amazon. Eg woozone
Is there a daily limit on how many products can be uploaded?
I'm not sure on this. but there are limit for request. which i don't think will affect you
Let me know, If you are interested