Customizing category and front page

Hello! I’m using a great theme, thank you.

Still I want to make a few modifications, but it seems too difficult for me do make them on my own. Could you please help?

1. Somewhere else here I read how to insert widget between post in the home page, and I’ve done that http://pumbr.ru/ !!! They do not even repeat in other pages !!! THANX How can I prevent them from repeating in the main page as well, if I make the widget stand after 2 post, for example.

2. How can I show less posts in the main page, say 8, and more in other pages, say 12?

3. How can I exclude preview of pictures in one category page (news page ) – I have images for all categories except this one?

Thanks a lot!