Do not try the combos from the trials, they are mostly useless.
Frame data helps but it’s not the thing you want to look at first, imo. Although if you want to you can.
For someone starting out, what might be best is to get down two combos.
The basic bnb hitconfirm. The purpose is to get out a combo that has fast start up and is relatively reliable and easy to perform, as well as having multiple button presses so you can “hit confirm”, or know that you are actually hitting your opponent and they’re not blocking your attacks. You want to know this because these combos end in a highly damaging move, but that move is also likely highly unsafe if blocked. I don’t know much of anything about Adon, but looking at the frame data a basic one for you looks like crouching jab, crouching jab, crouching jab, cancelled into a rising jaguar. The Adon Forums will probably help more, so be sure to check the combo thread out for your and ask around there too.
Your easy big damage combo. Basically when someone messes up big time you use this to punish. Again, don’t know Adon, so this might be best found in the combo thread for the Adon forum. These combos are usually only like, two to three button button presses, they’re probably just going to be something like crouching medium kick into rising jaguar.
You want to get both of these down so you can do them easily, in a real match. Practice in the training room until you feel reasonably confident, before going into a match. I’m going to assume you’ll start online first. Once you’re there, don’t take it too seriously and just play and learn and apply the combos you learned before. As you play you’ll lose a lot. Watch your replays, use those losses to pinpoint areas you’re weak at, and you’ll have an understanding of what areas to focus on and what to put as your weekly training plan that you want to make.