With my weekly curated newsletter I have used both sponsors and affiliate links. Sponsors work well in a narrow niche. I haven't had much luck with affiliates. Lots of clicks, little action. If you grow your list a bit, you will be able to find sponsors. You might not make as much money as you would like, though. A typical sponsor for a 2000 subcriber newsletter would expect to pay $50-$75.
I have found that the networking and status you achieve by curating a newsletter is more valuable.