The process of from getting the starter quests to take a rest

Run up to NPC. Talk to him by pressing F after you show him you are in combat mode by pressing R. With this done, you will see a window where the last tab is Quests. Go to that tab and take the two quests available.
You take your quests and then you know what to do. Press R to unsheathe your weapon. This will take you into a third person view. Hit your target by left clicking. Remember you do not have autotargeted ability, so you have to actually be facing towards your enemy and be aiming at her or him in order to hit, at the same time watch your stamina bar closely.
Once you defeat an enemy, you can loot everything on him. A tombstone will appear instead of its body a few moments after the death of your enemy. Press R to sheathe your weapon. Target the tombstone and use it by pressing it. Drag its contents to your backpack.
After a fierce battle, your stamina bar must be low. It is time for you to take a rest. Press O to load the rest .to start resting by left clicking. You will see your character sitting down.