Welcome to the Course and Best of Luck. Good job! Homework #1 Done!
Guess competition is the main reason why there are more and more people joining, just cause their friends play it. Long time ago started as well this way and also had a plan some day to earn some nice extra salary.
About stats don't take it with rush, with time you will get the understanding and you can't know everything while you just started with poker. Just take few stats at first and with hand evaluations and working with the coach you will get better. 
Discipline is common problem for a lot of players. Few things you could set up for yourself is that you can put a plan which you follow. Like playing according the plan, trying to follow it and at the same time trying to force yourself to be disciplined rather than ignore the game. Also try to avoid distractions which can cause even to be undisciplined. Don't let anything distract you. Always try to remind you what you are doing at the tables! Win! How can we win? By focusing of course more.
Most of the weakness you wrote can easily be fixed by posting hands (analyzing your session). We will start writing feedback to your play. Usually negative feedback will put you into thinking phase and trying to fix all those leaks. It's almost the same as you lose money, you will remember it more than winning part. By this situation it's gonna be that negative feedback you gonna remember and try to avoid them next time.
What about tilt? Do you adjust something against it? For example:
Easiest way to fight against tilt is to set up stop-loss technique. Which means if you for example have lost more than 3BIs for a session then you just stop the session for some time. The BI amount is set up from your own results. Some may put it higher, some lower. Also after the stop you can spend some time with evaluation part to become better.
Tight style is usually called playing selected hands. Like following the Starting Hand Chart. Aggressive should be also pretty clear that already the word says how you should be playing. But the problem playing aggressively is that you have to watch that you don't play too aggressive. Find good spots, find good targets. About The tight-aggressive strategy you can read in this article: "What is the Big Stack Strategy?"
Hopefully you will enjoy the Course.