Welcome to SRP. As everyone else sent you to the WIKI I won't repeat it, but it is the place to start. 59Caddy is correct in saying to take it slow. As a newbie, if you still have ears and a nose you're doing fine. Straight razors are precision tools that rely on the user's skills to perform well. This takes time to develop so be patient. Prep your beard properly with a hot shower or long hot face wash. Use good shave cream or soap. Be aware of your blade angle at all times and know where the tip of the blade is every moment. The blade may be ~ 3 inches long but that doesn't mean that the entire length is cutting hair. Practice, take your time and maybe more your shave time to the evening for a while so you are not rushed and can concentrate on your shave.

Good luck!