Welcome aboard and here's a few tips from someone who's been here over 6 years.
Have fun, accept it for what it is (both good and bad) and stay away from any game that involves credits until you find friends and a country club that has members you can trust.
You'll find that people who sandbag and have multiple accounts tend to dominate the WGT sponsored tourneys when you are in the lower tiers. Starting out those competitions are not worth the risk to you. The risk is also not worth it in any betting games (matches, etc.) against strangers. Don't trust that an amateur in tier is an amateur in skills and equipment.
Don't be in a huge hurry to move up in tier. The tiers and levels are somewhat balanced to give you access to proper equipment for where you are at. Too many complaints come from those who move up too quickly without putting in the time and rounds learning the nuances of the game and then find themselves no longer competitive because they don't have enough experience points to qualify for the appropriate equipment.
Other players here in the forums can help you out immensely with computer browsers, settings, equipment and playing suggestions. Much more so than I can. Pay attention to the people who really want to help you and you will get a lot more enjoyment out of this game..