Can someone do a quick mech launch tutorial, still can't perform with ease. Thx!

sure, here you go (Youtube).

Short explanation:

1. Enter Mech by double tapping Melee
2. Walk a bit to the right (not to much or you'll hit the screen)
3. Press Up (Not Jump!) to fly up for a fraction of a second.
4. Eject

Sh*t my jump and up buttons are binded on the same key

Jump works too, but it is faster to use the up key. There is this crouching animation before the mech takes off. You skip that, which makes the launch easier.