*hugs* you'll get through this. 300 is a bit on the high end of the scale... you need to be checking your glucose frequently until it gets better controlled. i know this can all be overwhelming. you ought to see if your insurance covers a diabetic educator. they're usually really good about teaching you how to use your equipment, diet, etc.
the following link *should* take you to the american diabetes association learning center for the newly diagnosed. it is a good place to start, when you feel ready to.
http://www.diabetes.org/all-about-di...learningcenter
good luck. i know this is hard for you and very overwhelming. pm/im me if you need to vent. if i'm not on the board, i'm usually on yahoo- my id there is isenephthys.