Do you know where can I find Those?
Because I always see in some videos of youtube a custom made melee weapons or guns or stuff like that

You can make em, or check droidz. Maybe ask someone who you think has those sticks, but you probably woundnt tho you seem to be a new guy :P

I'd always recommend that you make your own, to increase your skill and stay independent. If you really want some, though, you can go to Droidz or DarkDemon, or ask for one at one of the weapon shops here.

Thx ill try that out