The Angel Capital Association put our a great starter guide for people who are Angel Curious (my term, not theirs :)).
The Short version:
- Make sure you meet accredited investor standards
- Understand the risks of investing in startups
- Educate yourself
- Ask experienced angels for advice
- Join an angel group or angel platform (like the River Valley Investors)
- Develop an initial investing strategy
- Actively participate in Q&As
- When ready, write that first check