After you've collected all the required tablets,barett says something about..

Did you expanded your barn all the way down to the 29th floor??? Because it goes all the way down the earth, you will find that the last room is the entrance to Palermo Shrine on the 29th floor-find a hole in the ground and jump down.

Weah you will need alot of wood I suggest that you cut alot of wood and a fast way to get money is make strawberrys and sell 8 of them and with the leftover 1 you put in the seed meker to do the prosses all over again

All I can say is chop all the wood you can find, if you do it during winter it usually reappears in the morning. As for the cash thing make sure you have a seed maker and when you do have cash buy pink melon seeds and grow them and strawberrys at the same time, then use them in the blender to make prelude to love which is expensive ship some but if you want the cash straight away sell it in one of the stores. You usually get over 85,000g so you should be sorted for about 17 floors. It's only 50 wood so you should be okay.