I think that starting a tournament my only advice is:
*Do not rush:
Try not to look at the total number of players in the tournament, and focus only on what happens at your table. It's the only place you can influence. You can not do anything to change the course of events at the other tables. In a tournament with hundreds or thousands of players, you will be playing poker for a long time before reaching the prizes.
It is vital to remember that you can not win the tournament in these early stages. Resist the temptation to look at how many chips the chip leader has in the early stages: it's irrelevant. The only thing you should concentrate on is your number of chips compared to the blind. If you are in a comfortable position (for example, over 25 large blinds), there is no need to worry even if you have the short stack on your table. Just continue to unfold your game. If you make correct decisions consistently, the chips will eventually come to you. Only in the last stages of the tournament, when you get to the bubble or the last two tables, it may be important for your strategy to know how many chips your opponents have.