i want some help with jax

There aren't really any, Jax's laning is relly subpar in top tbh.

I've got only one:

Get a corruption elixir, kill a small creep from blue, get to lane, all in level 2 with full E duration

For first blood, you won't find many outside of manipulating your minions well, barring some even match-ups.

After you hit 6, 2 autos on minions, then leapstrike->W (to cut out the auto attack delay) and back away. When doing this, don't W too early or you'll just empower your Q. I usually wait for the 'smack' audio queue from Q.

If they're immobile, you can do 1 auto->leapstrike->auto->W for pretty big burst. Make sure your MS is slightly higher than theirs for this.

It scares most people away. Just don't bait yourself. Use it for trading, not all-ins. Never all-in during laning if your passive isn't stacked unless you're super far ahead and can easily kill them.