You should read the manual which comes with the game. Click on the SG Downloads link on the navigation menu on the front page of this website (Click home first if you're on the forum) and then click Smokin' Guns Full Game Downloads and download for your platform (Generic (Linux/Windows), Windows) or use the Mac for May news post link to the file if you're on a Mac. The manual will be in manual as index.html inside the manual folder if you extracted the generic 1.0 zip, is accessible for Windows users from the start menu after installation, or is part of the disk image on Mac.
You can remap or find out what keys correspond to functions in-game under options/controls, join a multiplayer server by clicking multiplayer in-game, using the get new list button to fetch a list of servers, then double click a server of your choosing.
Some important keys are:
F = Open doors, mount gattling gun
E = Equip scope (If purchased, only for sharps rifle)
B = Buy menu (Click or use numeric keys to buy new items)
R = Reload weapon (Sharps and peacemaker reload one bullet at a time)
Spacebar = Jump
W, S, A, D = Move your player around
Y = Global chat
U = Team chat
F1 = Vote yes (During vote)
F2 = Vote no (During vote)
ESC = Game menu (Buy, options, change team, etc.)
Money is laid throughout maps, or can be gained by making kills.
An online copy of the manual can be found here
If you have a headset, our official Teamspeak2 server is 220.127.116.11 (Port 17869) or you're free to use my Mumble server at ca.deviantptr.net (Port 64738)