(1) TIP:
If you keep going and going south, you will soon come to a River that is kinda like a small pond, if you go a little to the right or left (forgot which way) you will see a Underwater Cave, then go in, keep on going through the Cave (But don't Jump or you will hurt your CaveMan's head) After going a little, you will come to some fruit that will (might) make one Culture Level go up if you get the all.

(2) Get more people Quick
If you go south of your village, you will come to the Big Stone Tablets, pick the one called "Fertility" (look in your Booklet to find out which picture Fertility is), this will help increase people in you're tribe in the begining of the game. Now after getting this Tattoo (the picture that was on the stone that appeared on your arm), go and eat A LOT!! And I mean a lot, then you will have lotsa people to start out with.