Find what you like and what you feel comfortable selling. If you like portraits but find yourself uneasy shooting portraits, pick something else. Don't feel like you have to shoot that because everyone else is making money with it, whether it's a big sum or just pocket change.
So first, make sure you are really into it. That's important, because you don't want it to feel "routine".
Also, get friends, family to volunteer for you. Or if you hear of something that remotely sounds like an opportunity, offer something.
If it's someone close, do it for free or next to nothing when you are starting up. You are going to need enough to fill a small portfolio first.
Presentation. Have some creative business cards, and have an album ready to go. It's great to have a really good website with adobe flash, streaming music, and yada yada. It is still so much more appealing and intimate if you were to have some prints presented nicely at a coffee shop meet and greet. Even in this day and age.
If you want to do an art show, be creative, be tasteful. Not just the photography, but the frames, presentation, type of prints and careful up-rezing. Big prints show off careful PP'ing like nothing else. It's magical.
My next show in July will have prints painted on glass with LED backlighting. I can't wait.