As a noob, you'll have to run. A lot. So here are a few tips, most obvious saved for last:
1) If there is a [[guard tower]] nearby (less than 20 tiles) you can target an attacking mob (right click / Attack / Target) and type "help" in local chat, and the guards (who were probably standing around laughing at your incompetence in combat) will come running to your assistance. They'll even let you loot the corpse. Isn't that special? If it's on a hill, the 20 tile range may be extended. "Help" or "Guards!" are good to quick-key. '''Open the console (F1) and type ''bind 0 "say Guards!"''''' to bind saying guards in local chat to the number 0 key (you can use any key you want, not just 0 - but be sure you don't override a useful bind!).
2) Deeded lands are great places to drag aggro trains to. Especially if no players are there. The Spirit Templars are great at disposing of them. But be aware that some deeds don't have guards or guards that are told not to attack agressive animals at all.