My list is slightly different:
1)
buy a standard dart board (nothing fancy, nothing electronic) so you can practice at home -- you'll go broke trying to get good while feeding a machine.
2)
buy darts from a good dealer. If the store only has a small display, go elsewhere. It's been too long since I played so I can't quote prices, but they don't have to be horribly expensive -- just
buy a grade or two up from the lowest.
3) Try a variety of flights. I was stuck on mediocre until I tried different flights. I went through several styles/materials before finding one that gave me real consistency.
4) If you go to a regional or national meet, budget an extra $100 a day for unforeseen expenses and have access to a few hundred more in case you need to make bail.
Don't ever take your credit cards with you!
5) Try to get decent with both hands -- you'll freak out your opponent if they see you warming up right-handed and then switch to left-handed in the match (or vice versa).
6) When in doubt, aim for that little red dot in the middle.
