I am 20, home from college for the summer and have been doing about 20-30 mins of weight works outs 3-5 days a week and running abour 5 days a week. I have a pretty good diet, and I on and off practice sparring and some fighting workouts. In the 3-4 weeks I've been doing these work outs I've already seen results.

I really would like to get more cut up and build some muscle over this summer, since I have the time and am not doing too much else other than some classes. I am around 135 lbs. and 5'8.

I just need some direction on what I can do to see some improvments and enhance my results. I don't really want to loose any weight, but I don't want to get too much bulkier either. Can anybody point me in the right direction here? Thanks

You are not going to have much luck addi muscle hile running 5 days a week.
Get cut? Diet and HIIT.

Add Muscle? Diet and Wendler's 5/3/1.

Cutting and gaining muslce is very hard to do. Focus on cleaning up your diet and bulding muscle. At 135 you need to gain before you lose.

I've got a fair bit of info on my site that you might find useful. So I hope it helps.
Goodluck...

What do you mean "on your site" ? How do I get access to it?

On a side note, what kind of diet should I be going for to build muscle and get cut?

You can find my site as my signature, but it's Apply.Fitness
If you want to build muscle, you would need a pretty full diet, and a lot of protien, depending how much muscle you have on your body at the moment, you might want to cut your diet and increase sets and reps in your routine. But as I said, I've got a bit of info on my site.