Does anyone know how to fix this? (Blog question)

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Hello everyone. I´m sorry to bother you, but I really need your help. I have started a blog and there are some things I would like to fix, but I dont know how. Maybe you can give me some hints. Please visit my blog first so yo can have an idea of what I am talking about. -How do I increase the "Mainframe" width?. I see some wasted space in the screen, because the place where the posts go isn´t wide enough. Paragrapghs look too tight. -How do I make my latest posts appear below the old posts. For example, I would like to put the "Home based business" title first, and the "Paid to read e-mails" one, second. I hope you understood what I tried to say. Thanks in advanced.