Where to start.......possibly using paragraphs might help!
The tiers are not based on levels, but on scores - and are just reflective of your ability. They are not accurate as they are based on x number of games, and the best scores over that tier. Pros usually do not shoot 21 over - but occasionally they do. Conversely PGA tour players do not shoot 21 under, as happens in this game.
The meter (an you have a choice of meter types) are the same for everyone. As you will see by players scores, this game can be mastered but this takes practice and dedication, and then a lot more practice.
You do not need to spend copious quantities of money, even with starters kits you can still score pretty well from Pro tees.
The key is how much you learn, and how well you learn the courses, the shot types and the attributes of your clubs,
Obviously the game is easier with better clubs, but enjoyment is personal - set your own goals, as enjoyment is a subjective thing.
Read the forums for tips and hints, then take notes as you play, and with a lot of practice you will improve.
This is a great game, but it is not easy to learn in 5 minutes - if it was we would all be long gone.
Alan
ps if you want a game at some stage, and I am green, just invite me and we can talk through the shots.