TOO MUCH OR TOO LITTLE

A question is how much widgets and other things shall you have on your blog. If you have too much the blog will be a big mess. If you dont have anything will the blog be boring, maybe. I have not the answer, but it is important to find it. It is the same problem with ads, how many and how big and the place to put them. I will come back to it later. If somebody have som answers please tell me.