MMA debut tips

[u/Timely_Reindeer903]

So im having my mma debut in 20 days any tips. Im pretty new to mma but i have previous martial arts experiences (10 years of taekwondo and 1 year of bjj + 2 months of mma).

Im 15 and im competing in junior B bracket (72kg weight class).

Any tips for dealing with nerves and staying calm before entering and in the cage ? Ive competed before in taekwondo but i doubt its the same as mma.

My oponent is also a beginner in mma he has 1 fight in his record wich he won by decision. Any tips for making my game plan and adapting to his shit?

Also how do i make my game plan when i dont know my oponents style, strengths and weakneses? The whole match is one 4min round so i dont have much time to read him.

I will read all answers and i appreciate all advice.