a little help

I am attempting to update the look of my blog.  I think I like this layout so far...but I have a few kinks to work out.  So this is a shout out to the universe (aka...you, my dear friends.) for some tips.  I would like to make my title centered.  Can't do it.  Don't know how.  I also think it would be neat-o to put my title in some sort of picture.... can't do that either.  I also added a cute little image on the side bar (see: side bar) but it is smaller than I want.  Does anyone know how to enlarge that?  Ok....thanks all for your suggestions!  loves.