You hadn't referenced anything specific at all. At least now you've mentioned Star Wars and lasers together.
I can tell you that the laser blasts in Star Wars was generated by striking high tension wires on a radio tower with a wrench.
I'm also not sure what it is your trying to do professionally here. If you wish to sell sounds, downloading these things for yourself or buying samples only to resell them dosen't sound like a profitable line of work.
There are only a few ways to generate original sounds to record for sound effects (for movies and the like).
One is to create real sounds using real objects in the real world (stabbing watermelons for Jason-esque knife plunges for example).
The other is to create synthesized versions of sounds electronically. I do it all the time. I've created a dentist drill, waves with sea gull calls, applause, train whistles with steam, popcorn, gunshots, horse hooves, insect wings and scores of others sound effects using nothing more than
a Roland JX-8P.
If you are after the first, there's plenty of "how to" references around that will teach you how to use slabs of meat for hollywood fist fights and kitty litter with loafers for walking up gravel garden paths.
If you are after the second it takes patience, a fine tuned ear and a thorough understanding of how to craft sounds from whole cloth armed with nothing more than an analogue or digital oscillator.
Good luck.
Carl