Need some help trimming hair?

Ok so I just got a pair of clippers and gave myself a number 1 buzz cut, which is great looking, except I noticed that in pics of a number 1 cut, the hairline has a straight, round look, and I noticed my hairline is kind of receding. It comes around straight on one side, and the other side starts to go higher. I also have a little patch of hair growing down the middle instead of continuing to go straight. So my question is do I trim my hairline with my clippers to make it straight and all lining up. If so, what do I do about that stubble that will want to grow back? Thanks.