I hate crowdsourcing sites because what they boil down to is asking your mom, favorite uncle, and fourth-grade math teacher to support your dumb hobby except with one more layer of abstraction (and feigned legitimacy) between you and them than if you were straight-up begging. There's strength in humility; if you're going to beg for money, beg humbly, not through a crowdsourcing site. But if you want a sleazy way to raise an insignificant amount of money for a bad film, crowdsource away! Fwiw, this is just my stupid opinion.
Honestly, the first thing is to decide is if you want to make something good or you want to learn and try to make a movie. If you want to make something good, get real money. If you're not a good director, hire one. Hire a good sound guy, cinematographer, gaffer, and AD; scour reels and resumes for young, emerging talents and pay a fair wage (i.e. minimum wage) to the cinematographer, gaffer, AD, and sound guy. Some directors, particularly those coming off festival wins, are good and will attract other talent to work cheap. Be really wary when watching reels. Watch lots of them, then watch them again with your director. Also, no one gets his or her real day rate, so lowballing is generally okay so long as it's not insulting. Fill your crew with free grips, interns, etc. looking for credit and union hours and be generous with food, money for transpo, and credits and at least some should stick around.
If you're looking for real money (i.e. hundreds of thousands or more, so still micro-budget territory; low budget is about 2 million plus and thus trickier) look for people in the community who love movies or who have extravagant hobbies fostered by sudden wealth: hot shot real estate agents, dentists, businessmen, etc. Attach yourself to someone who won at some festival that sounds prestigious, as suggested above, and then name drop. Name drop your actors' credits everywhere you go (assuming you have name actors), even when negotiating deals for locations (again, look for people who like movies and these can be free) or recruiting extras. Then look for investors who buy ostentatious bad art and have jet skis, people who once wanted to work in the arts but sold out very quickly and equally successfully. You won't return a cent on any investment so promise huge back end points or whatever it takes, let them meet and hang out with the actors and director, who cares. And name actors aren't actually that expensive. Look on imdb for movies in similar budget ranges to your own for casting inspiration (Asylum films is a good place to look to see who will work cheap). Having names really helps if you want to get distribution.
If, on the other hand, you want to make a movie for fun and edification, just make it and have fun with it. Hire sound and camera if you want it to be watchable, do it yourself if that's what you want to learn. I'm bad at sound but openly admit it's more important than a good image for baseline watchability and you can get pretty darned far with just a $300 boom mic and competent operator, whereas getting a better picture requires more money for less return. So just grab a cheap camcorder. Pretend it's bad because it's dogme. Be a little ambitious but have fun with it. If you've hired a cameraman (hint: do this, unless your interest in the project is that you want to try operating, which is not the interest to have if you want to direct), work with the actors and leave the technical stuff to the crew. I think the worst mistake you can make with a legitimate micro-budget project (see above) is not taking it seriously enough and the worst mistake you can make with a fun project is taking it too seriously. I'm hoping to eventually make some zero-budget/no crew youtube videos of my own...