they are high becasue there is not enough bacteria to break them down to 0 which is what you are looking for..your bacteria population needs to grow..depending on what you started with, dry rock. live rock, all dry rock a little live rock, your sand bed..it just all depends..They will start going down, IMHO is when ammonia gets close to .25 add more ammonia, this will keep building up you bacteria populations while you wait for your nitrites..you will soon see that it won't take long for your ammonia to drop, and then you will be waiting for your nitrites to drop..
As said above each tank is different some people see nitrates right off the bat, some don't