hit Shift+` (tilde)
to bring down the console, then type:
to enable cheats.
npc spawn <creaturename>
Where creaturename is the name of the enemy. Like "stormtrooper" (without quotes) or "reborn"
Lists of Npc's are posted if you look hard enough.
can give you stuff, like "weapon" (or "weapons" without quotes) etc. give all would give you everything.
Check for more on sites like gamefaqs....
The game is free to play online, besides whatever you pay for your ISP/network. You don't need to sign up for the Zone or anything else to play, it has a built in game-finder.