There are tons of information on the Forum that will answer your questions...
You just need to do a little research and reading on your own...:yh:
Don't forget to read the Newcomers section and the Forum Rules...
You can use any Laser of your choosing from a DVD or CD burner... just
read up on how to do it on the Forum..
Welcome to the forum.
Yes, you can use a DVD player or CD burner's diodes but they won't have much power.
If your going to the trouble to build a laser ,why build a low power one? You can buy those at Wal-Mart.
You can buy a LOC or LCC for around $10 (for beginners, I'd recommend the LCC, LOC's are very picky about dust.)
If you need more info,(you do) the search button is your friend. LOL
You can buy the diodes here:http://laserpointerforums.com/private.php?do=newpm&u=12964