1)join a kingdom quest (you can join one around lvl 5 click the button that looks like an hourglass by your map and if it says recruting by it you shold be able to join).
2) you need to kill at leaset 5 monsters or you can join a party and they will do it for you.(a tresure chest should appear by the time and your lifes if you have defeated 5 monsters).
3)you shold get to lvl 6-7 by the time the kingdome quest(you should lvl up at the end if you completed it and killed 5 monsters). Tip:if someone in your party kills a monster you get the same crdit.(exp,if you need a monster for a quest,etc.)you will NOT recive the drops but it is always a good idea to join a party in a kingdom quest especially if you are a low lvl.
4) go to the rookie hunting grounds (in roumen) and then kill 3-11 slimes. When you are done you are done with that, you sholud be lvl 10 (is worked for should it not work for you post it and i will get to you). hope this helps