Oddsmakers will set the lines according to the implied probability of either outcome happening. The sum of the probabilities exceeds 100%, as sportsbooks take a small cut on both sides of a line. Second, sports betting odds dictate how much money a bettor needs to wager to make a certain profit.
You should be just fine withR$1,000. As Gambl-R and Trifecta mentioned about tips, I wouldn't fuss about them. When I go with my friends, gambling and food are the big hits for us and I can makeR$1,000 last for 4 days, so you should be fine withR$1,000 sans gambling. WE did 1,000 each and was just perfect.