if you want to get the scout weapons eg. do achevments
Weapons cannot be "leveled up" in TF2
You get metal in TF2 either by trading or by crafting down the weapons you find
Strange weapons are obtained from unboxable crates.
No you cannot trade weapons for beta tf2 to normal tf2. Beta Tf2 is considered to be a completely different game by steam. Therefore the two game's inventories are not compatible.
Nope, everything on your profile for TF2 (backpack/controls etc...) is kept online.
no
download them from garrysmod.org
You can't pick up weapons. The weapon you wish to use must be in your inventory and then you can equip it.
Nope, sorry.
No, because robots are AI and strange weapons only track player kills.
Just playing the game then trading those weapons for the weapons you want. That won't work because what if you were free to play so this may take a long time but you randomly get weapons when you play :]
You can either play a lot and hope you get lucky. Or you can craft extra dropped weapons into hats.