1. I've set trainings for my big men to shot blocking 2 days ago but I don't see any difference in their skill value....Why is it so? How long should I wait?
There is lots of info on training, I highly suggest you go to the Help forum and read the stickied posts on setting up a training regimine. It is the most crucial thing you need to do in order to succeed in the game long-term.
But to answer your question...it takes a LONG time to get good results with training most of the floor skills--for a given player, anywhere from 2-3 weeks of training just to get one "pop" (i.e. a jump of one level in the skill). And that is for young trainees (teens or early 20's at the oldest) and with a pretty highly skilled trainer. If your trainer is a much lower skill (by default, you have a lvl 1 one) and your players are older, training speed slows down a lot or even simply stops.
In the very, very short term (next few weeks), I would suggest you do "team training" on either stamina or free throws. Both will help your team, and unlike any of the other trainings in the game, your trainer quality doesn't impact speed of training these and neither does the age of your players. If you train either of those things, you should see probably at least a third of your team get a "pop" at the next training update...and it's always nice as a new player to see those little green arrows next to a skill signaling it has just popped.
There's only about two weeks in the season left, so maybe just train stamina or FT for these last two weeks, and that gives you a little time to decide what positions you want to train long-term, buy a good quality trainer, and buy some good trainees.
2. How does the potential rating works??
In the short term, it has no real impact upon you. The only time it matters is when you decide what sort of training program to use, and you are looking to buy trainees. And even then, for a beginner, it's not a huge deal. You have more important things to worry about for now.
3. Well, I won my 1st match but I don't understand how and why did I win the match?
Already answered by someone else.
4. I know how and where to go to set tactics..But I don't know which tactics I should decide on...How do I decide on my tactics?
Read the "tactics" section of the "Rules" page ("Rules" is one of the first options on the top left of your screen). To put things in the most general way possible, set your offensive tactics to fit the strength of your team--if your guards seem to be better much than your forwards & Center, then use an outside-focused offensive tactic like Motion or Run & Gun. If your C & F seem to be much stronger, use an inside-focused tactic like Low Post or Look Inside. If your team seems reasonably balanced, then some sort of base offense would probably be best, unless your opponent seems to be much weaker at some part of his defense than another (in which case, attack his weakness). When setting defensive tactics for your team, essentially you want to try to guess what your opponent is going to do offensively; if he has strong guard play and tends to favor outside attacks, then use a 3-2 zone or 1-3-1 zone for your D. If your opponent tends to pound the ball inside, use a 2-3 zone. If your opponent seems to be pretty balanced, then a balanced D like Man to Man is probably best.
5. How much should the ticket price be? I seem to be losing money now...
The general rule is that you need to look at each of your seating sections, and then see how many tickets to those sections you are selling. Are your bleachers selling out? Raise bleacher prices. Whereas if you're only selling half your seats, then it makes no sense to raise prices because that will just drive people away.
Do the same thing with each of your seating sections. If the section tends to be sold out, then raise price by a little bit. If