I have a much different suggestion that most. Connect with a local group that is already doing work for a start up or major company. Building relationships is far more valuable in my mind then anything else you can do. While having a killer portfolio is good, just like resumes often times porfolios are not as authentic as one would have you believe. Quality relationships that can give you referrals or references are by far the most valuable thing you can develop.

I worked for a large company here in the states that outsourced all of their development to India, we had about 100 full time developers on staff. That team no longer exists however whenever I need to outsource I go to the relationships I established from that team to either contract directly with them or get recommendations from them.

It might not be what you want in the short term, however it is a great way to make connections and reduce the barrier to entry for you.

In my mind the barrier to entry for most startups is time and to a certain extent money. I know I cannot afford to take flyers on developers who I don't have confidence will deliver for me on time and on budget and what is worse if someone fails to deliver not only am I late but I am also out anything I may have paid for the work.

I hope this advice assists you in some way.