I did it for a couple of years, and I think I got paid $15 a game. Mind you, I was 18-19 at the time myself.
There is an LBW rule, but only if you don't offer a shot and the ball would have hit the stumps. There is also this thing called the "third ball rule", where if the two previous balls were dots, you must score, or you will get "dismissed" (-5)... but that rule tends to be at the discretion of the centre... it's more a rep rule, and not really used in social comps, particularly in the lower grades. And if the ball hits the back corner of the 'net, and the fielding team claims a catch, that is always quite a hazy area, as you can not be caught straight off the back net on the full, but you can if it hit the side net first. And always watch the number of players in each half of the court... if there are any more than 4 in any half before the batsmans has played at the ball, it is a no ball. There are of course other rules, but they're the ones I could come up with off the top of my head.
It can be quite stressful if you get two teams that take it very seriously, and especially when the games are close, and one run or dismissal can mean a win or loss. And also because they always believe that they are right and I know nothing, and with me wearing glasses, well, the obvious jokes were flying around.
But if you just get two teams that are there for a good time, it can be quite an enjoyable and rewarding experience.