First of all , i think that gambling on a small budget is a wrong thing to do since you'll be dragged to bet on high odds expecting quite huge winnings when you weren't even able to bet with high stakes , that will eventually make of you a greedy person and a greedy person is by default a bad gambler .
I think that one of the best pieces of advice to give to someone who is betting with a low budget is to make single bets and half of your money on that single bet , it'll be good returns with small risks , and if you loose you got the remaining half to compensate .
Talking about risk, the thing with gambling is that it is a high risk move to ever make and you simply do not want to get so greedy and better to find a way to minimize those risk in a way so as not to end up getting screwed easily.
As you keep going further and the stake keep going higher, it keeps getting even more risky and luck is the only thing that plays the part, so better to just go with what you can afford to lose no matter what, but if you cannot afford something reasonable, it does not make sense gambling anyway.