Ahhh the force is strong with this one 

The cold weather sucks and limits my training mostly to indoor upper body strength training, but I have been able to practice my monkey vaults and other vaults when it isn't too cold outside,I have found someone to train with. He is one of my friends that has been conditioning himself with out knowing for a few years and wants to actually practice the art of parkour.

Thanks and any tips for how to do a monkey vault? Because I have a knee high-ish fence in my neighborhood that I have been trying them on but my body just won't do what my mind tells it to, instead of going through my arms, my legs go around them when I tell them to go through my arms.

To do a monkey vault, you need to jump first. So since you're jumping, you don't really need a vault, lol. Try it on a waist-high fence if you can find any.

Well then, before jumping over it, try getting on it, with your hands holding, and your feet between your arms. It's easy if you're skinny.

Then you need some core exercise (a.k.a. your abs). Sit-ups are good for starting, then you can do L-sits (sit on the floor with your legs straight in front of you, place your hands on your sides or on 2 higher objects, and raise your legs off the floor, carrying your body on your hands only.)
Good luck. I hope this helps you.

You two should work on your Quadrupedal Movement:
Place lots of stationary objects on the ground (rocks, or anything that doesn't slip) and make a long path, and use all 4 to move across them.
Doing this will help you use more range of motion, and will also work out the muscles you need for Parkour.

I wouldn't do sit ups for core training. They work your hip flexors not your abs(pushing a lawn mower actually helps your core more), plus they can mess with your back if you do them wrong. L-sits are good and also hanging leg raises. Planks as well. Pushups help a little if you are doing them correctly, but one arm pushups are a lot better for that.

There is a way to do a crunch that uses only your ab muscles and not your hip flexors. "Dr. Janda had his patient assume the standard bent knee situp/crunch position and placed his hands under the latter’s calves. The patient attempted to sit up while steadily pushing against the doctor's hands. This activated the knee flexor and hip extensor muscles (the hamstrings and glutes). Reciprocal inhibition took place and the hip flexors relaxed. The result: back stress was eliminated and the abdominals were isolated!" -Pavel Tsatsouline

Oh, and can anyone give me tips on how to roll because, when I roll, my right knee hits the ground.

http://www.youtube.com/watch?v=y6I1J0zmE7U

that's a guide made by urban current. they pretty much cover EVERYTHING in detail