Lock it in a drawer for two weeks. Seriously. Keep yourself away from it for two weeks or else you WILL make some hasty and wrong decisions.
After two weeks, reread it. Does some stuff seem odd, or in need of fixing? If so, and it will be so, aren't you glad you took time off from it to notice?
Evaluate problems, fix them and take another week off.
Repeat this process until there is very little to fix. The script will never be perfect, but you want to be sure that all formatting and structural problems are absent.
Ask yourself what you plan to do with the script. Festivals? Producers? Agents?
Make a list of possible people/places to send it based on your answer to Step 5.
Hope for the best, expect the worst and use it as a learning experience. The first script I wrote won a festival, but looking back, it's the worst thing I've ever written. The experience taught me a ton, however.