all right then, I'll boost my research, but should I invent researching lvl 2 first in order to get 50 000 pts quickly?

I wouldn't. A 12,000 research point expense is difficult to overcome early in the game.

well too late, i did:) now its almost 50 000, with 7 vills working on farm and 7 on research table and one kid, and the village is periodically attacked by famine, but everything is turning up to be OK

Just let me make sure I'm getting this right. Nothing you do (ie. watering the crops, planting, etc.) makes any difference in the crops growing once your have Level 2 in Harvesting? So, I should probably have all available villagers doing research instead of watering and farming?

That's not exactly true! Village Sim is more complicated than that. Villagers will continue to gain valuable farming skill working the farm (even when there are no crops to be harvested), which will pay huge dividends a little later in the game. While putting all of your villagers at the research table during times that the farm is bare will not necessarily disrupt your tribe's immediate food supply, it will have an ongoing effect on overall food production. That will, in turn, affect how quickly you are able to grow your tribe, since increasing your village's population depletes the food supply more quickly. It's always a balancing act to decide where to deploy your villagers at various stages of the game.