How can I use my law degree to get into the startup world?

Pretty much the best way is a combination of what Adam and Nick stated:  either (1) don't practice law, rather go work for a startup, or (2) work at a startup-focused law firm…. if you are good you will eventually be recruited by one of your clients (and you'll have the benefit of knowing the team before you join).  Chris also has a good point although there will be a lot fewer of these types of opportunities.

See question on Quora