Guys, how can I make a facebook giveaway?

Maybe ask on Facebook? This is SteamGifts.

Seriously though, this should work

You just gotta believe in yourself!

if u can get all their names or sumting than write em in the list here http://www.miniwebtool.com/random-name-picker/

If you're intending to do this via Steamgifts, one method would be to set up a private group (and a group giveaway for members of said group), then invite anyone who comments on/likes your Facebook page to join.

Alternatively, you could make a private giveaway, and send them all the link, but the link could easily be shared, meaning the winner may end up being someone who didn't like/comment on your page.

You can use this. Every one gets a number, and then you generate a random winner.

Use woobox maybe? Tons of shit uses Woobox for GAs, including stuff on FB, and the site says you can start free, but I don't know for sure how it works to get access to the app. Best I can come up with besides just doing it manually.

Alternatively you could just give a link to a Google doc spreadsheet, and have everyone enter their own name on a line... Then you could just look at the total number of lines, and just do a random number generator up to the total number of entries. shrug