First things first: learn to tech throw.  You can do this by pressing throw (light punch + light kick) as they throw you.  So even if you get caught by throws, you still have this option.

Now, for the situation you described, I suggest hold block while mashing light punch/kick/throw.  You will block whatever attacks they throw out, and if their attacks are too slow, you'll either jab or throw them.

I do not suggest low hard kick.  Most characters have a slow one, too slow for close range, throwing distance.  Light attacks or your own throw work best here.

If they jump early, try walk forward (until they will just miss their attack but you're still next to them) and then throw.  Alternatively, Focus Attack - Back Dash would work too.

is ok. i'm now a sandbag of danger46. ehhe