TrackDayKC

Ive been following KSP for quite some time, but have always waited to buy until it became "1.0" Ive seen videos where people use addons, but have no real idea which ones i should try out first. Mechjeb and engineer seem obvious, as i am interested in seeing the math and numbers behind spaceflight. My ultimate goal is to create a Munbase, and space stations around both Kerbal and the Mun. Any suggestions from you seasoned Kerbalnauts would be great.