Recovering your corpse
Your corpse will be lying where you fell, so it's a simple matter of walking back to where you were fighting. An orange arrow on your minimap (top right of the screen) and a gravestone on the your full map (M key) will help you find it. Once you are close to your corpse you will get a message asking you to resurrect. Do so and then heal yourself before continuing.
Better rewards
Once you have got your 10 pelts, head up to talk to Seer Graytongue to complete your other quest. He will give you a quest in return to retrieve 12 bristleback belts and offer much better rewards than you have been used to, including a nice replacement staff. Don't worry about that one for now because we're going to go get another couple of quests that can be done at the same time. Head back to camp.
When you get to the camp talk to Grull Hawkwind to complete the The Hunt Continues quest, choose the bracers as a reward and accept the The Battleboars quest from him. You will also see Brave Windfeather walking about the camp with a quest for you. Talk to her to get the Break Sharptusk quest. Before you head out to do these make sure to sell any loot you don't need.
All three of the quests you should now have can be completed in roughly the same area. If you bring up your map you will see a cave marked Brambleblade Ravine. Chief Sharptusk can be found in there, along with the bristlebacks that drop the belts. Along the way you will also come across battleboars that will drop the snouts and flanks you need. Head out towards the cave.
Aggressive monsters
As you get close to the cave you will come across the battleboars you need. You will notice that the name above their heads is red in color. This means that they are aggressive enemies and will attack you if you get close enough, even if you haven't started to attack them.
Walking about in areas filled with aggressive enemies is a lot more dangerous than what you have been used to up until now, so be more careful as you approach the cave. Kill the battleboars you meet along the way to get your snouts and flanks. Don't worry about getting all of them because you will have to pass back through here later and there are more battleboars inside the cave.
If you do get in to trouble and end up with two or more attacking you at the same time then don't forget to use your heal spell and your War Stomp spell to escape. If you use War Stump to stun them then you can run away and hopefully shake them off. When you run far away enough from an attacking enemy then they will eventually lose interest in you and give up trying to kill you.
Close fighting
Once you reach the cave head on in. This will be your first example of a dungeon like area, where aggressive enemies are pack in more tightly than out in the open areas. It's important to keep alert in these areas while fighting in case a second or third enemy sneaks up behind you and joins in the fight. You will need to make your way through the cave at a slower pace than before and make sure you kill the enemies in your path rather than try to avoid them.