How many entries in an RSS feed? And can I create pages for RSS feed?

I am creating an RSS feed for a website I am working on. I read about RSS and it is pretty simple: It is a specially formatted XML file.

However, I could not find information about the following two questions

1. Is there a limit to the number of entries/items in an RSS feed? Should I have 10 entries only? Or can I go up to 100 for example? What if I have more entries than 100 per day? What can I do?

2. Can I have pages with each page displaying 10? So for example, www.emample.com/rss/ will give page 1, and www.example.com/rss/2 will give page 2 of RSS, and www.example.com/rss/3 will give page 3, and so on. The reason for this question is the following: If I am restricted to only 10 rss items, what happens if I have 50 items updated to the site since my last RSS update?

Thanks.