also how do i load order ? http://i.imgur.com/BobyFwa.png

also i would love a mod that had the Rock It Launcher from fallout 3 (would i need to own fallout 3 just for that x.x ?)

This awesome mod restores Fallout 3's weapons, including all the craftable ones: http://www.nexusmods.com/newvegas/mods/40007/?
No need for anything special with that, just install as usual.

As for crafting mods, i never play without Ammo Crafting Schematics: http://www.nexusmods.com/newvegas/mods/41013/?
Obviously, that is only for ammo

Load order management is best left to LOOT: http://loot.github.io/
And Gopher has helpful video about it too: https://www.youtube.com/watch?v=SzoyWugzZAw

Edit: That's for an older version, it seems. The latest version has totally different interface. Still, the basic function is pretty much the same.

how does LOOT work ?

and do i want the FO3 weapons above or below DUST

Gophers vid is dated everything he is showing is different from how it is now

no idea what im doing x.x http://i.imgur.com/os6vaqc.png