like ElektroFreak said, people are happy to help if you know what you are doing (kinda), noobs who join and ask, "How do i makez a burning lazer to burn my sist0r?" aren't very popular around here lol...so after you read those start to get an idea of what you want in a laser...
1)How many mW?
2)What wavelength? (color)
3)What style do you want? (in a flashlight? side button? tail clicky? fit in your pocket? labby?)
Answer those and people will be able to recommend a build for you...