So, right now I have.... nothing.

Basically, what I want is to make a grenade that bounces on its way to the target location. I also want the grenade to be detonate-able before reaching said target.

Anyone know where I'd begin?

I'd say you should make the Grenade a unit.
Then figure out how a "Jump" ability can be worked out.
Then read this: http://www.staredit.net/starcraft2/Timed_Life

Then have fun.

You can use a missile unit and a custom mover to do bouncing. Not sure how to detonate it with an ability yet.

http://forums.sc2mapster.com/resources/tutorials/4855-data-customized-projectiles-advanced-difficulty/#p1

This -might- help.
(You'll understand I haven't read the whole thing. )

Making it detonatable before reaching the target could be done with a Search Area effect and a damage effect with splash. Give the grenade a combination of flags that isn't used anywhere else in the map (let's say Robotic and Biological) and also flag it as a missile. The detonate ability should call a Search Area effect that applies a damage effect to all friendly units flagged as Robotic, Biological, and Missile. Give the damage effect enough damage to destroy the missile (most easily done by giving the missile exactly 1 HP and no armor) and splash.

Of course, you could also use a validator instead of the flag thingy, but I don't really get validators. >.>

Validator would be much better because you could say it needs to be a grenade using a unit type validator.

Where is our Validators wiki?

Could someone at least do the Mover for me, I tried and I have absolutely no idea...

You should look at the sc2mapster link payne provided. It does a good job of explaining what most things are for, it will take a bunch of tweaking on your part though.

Ya, I was actually linked there three times and found it before anyone even linked it. It's too complicated and I really don't feel like getting into it D: