You may find some of the following links on Wikipedia useful:
- WP:Sandbox, where you can make all the test edits you want
- A bit about using edit summaries to explain your changes
- Wikipedia's notability standards with subpages for people and music/bands
- A bit about the need for verifiability, why even apparently-helpful edits may be reverted
- Biographies of Living Persons, common called "BLP," which sets out special standards for writing about living people
- NPOV, or Neutral Point of View, a critical element of Wikipedia.
- My talk page, where you're welcome to contact me with questions or for help.