If the minimum bet on the crap table isR$25, that meansR$25 per bet, at least on the main game (I'll get into that in a second.) If you want to play both the pass and don't pass lines, it will cost youR$50. The minimum will be the same for all the place bets, come bets, lay bets, etc.
High is 12 and Low is 2. These are the highest and lowest possible dice combinations possible with two Las Vegas dice. The pay outs are high but so are the odds of hitting them. Mostly the odds are 31 FOR 1 or 30 TO 1.
