Try this for a good start to get to other planets
http://ksp.olex.biz/The above explains how to do it.
Also get the protractor mod
http://kerbalspaceport.com/protractor-for-ksp-0-18/That will help you do it so you dont have to stick a protractor to your screen. Once you install protractor, it has to be unlocked in the science tree.
Otherwise get the angles you need from the website above and eyeball it with manoeuvre nodes.