1k is definately optimal DEPENDING on your style of play. If you like seeing pots, getting in with 1K is the way to go. Me personally I usually buy in for $200-$500 again, depending on bankroll and money at the table. $100 is not enough, your actions are very limited with $100.
I can tell you poker is the way to go if you wanna make money instead of sports gambling, I mean, gambling it's good but is delusional in most cases to think you'll end up profit, when you bet on sports lose what you can afford and always have fun. It's easier to master poker than sports handicapping , you don't need a bankroll as big, you can score big with low risk (way easier to hit a $5 tournament than a 12 team parlay IMO), luck is less of a factor (variance is more of a factor, depending on style of play) and there's always the chance to win a nice package to travel and play.
If you want to start reading some basic books I can recommend you a couple or even send you the link to download the PDF files.
nah ive tried poker. too high strung for that game. i like 7card stud though. in fact i think its more fun than hold em personally. thanks for the reply!