Get a full time job, make friends and treat everyone with respect, work hard and do a kickass job in something essential for the company (that other companies also need), then quit and offer to consult for them. They’re your first client, which builds credibility (and eliminates suspicion you left on less than optimal circumstances). Write a blog and/or volunteer in the local tech community, and you’ll be surprised how many referrals you can get. Also, other ex-employees of the company can be wonderful referrals. Good luck.