Two things to grab now: Astro File Manager and Dolphin HD (web browser). I'll post a link to the last version of Dolphin. The newest one doesn't work properly on the NOOkcolor. These are popular and people can assist you with issues. Of course you're free to make your own choices. You may start with an app then delete it in favor of something else.
Edit: Here's the link to Dolphin HD from another thread:
https://www.mobileread.com/forums/sho...22&postcount=9