I think you should do some standing,
I would practise two things,
1, bait a take down. Ie dangling a leg and let them attack it (I find it often get top position from that scramble).
2, pull guard.
After comp work some takedowns.
Take her easy man, its you first comp, have low expectations but allow yourself the opportunity to win.
Avoid lifting weights that week, esp leg works out.
Ask your coach about the scoring system, it seemed fair enough when I was new to it but it does have a few areas to be aware of.
Try to organise someone knowledgable to give advice during the match.
Don't cut weight unless its like 3 pounds or so, and if doing that do it by diet not water cut.
Pulling Guard against a guy you know nothing about can be sketchy, if he is a wrestler you porb did the right thing, if he has exceptional top control you fuked up.
But hey try your hand at standing for a bit, if its going badly pull guard, but it should be plan B not plan A.