@Grassland Farm and TMIT, thanks for the replys.The thing is you guys went heavy on the technical terms in your replys and i am still to reach that level of expertise concerning civ4.
Please if you could resummarise in simple mans terms that would be great.
Let's have a little translation then!
Settled GG: A great general used as a "Super Specialist" in a city, to boost the starting experience of units produced there.
CHA: short for Charismatic trait, here we talk about it because it makes XP promotion easier.
CR: The "City Raider" promotion.
CG: The "City Garrison" promotion.
To make it short: Military academies are useful for late stuff like nukes ('cording to TMIT)
Settled generals should be just enough to reach 10 XP (8 if you are charismatic), you can also make use of the civics vassalage and Theocracy.
Having a general lead a troop is useful to access promotions that otherwise can't be given to random units: Medic III, Leadership...
Take a look at the startegy articles, you should learn a pack'o'stuff.
otoh military science is a bit sidetrack which doesn't lie on any useful tech path and especially for your renassaince breakout you just basically will skip it and getting it from trades is doubtful, since you really are in era where you want to attack with cuirs (rifles) against longbows (and not grens which will be the trade for MS mean).
Well, IMO it is wise to have Cavalry. They have a fair higher withdrawal chance, and the 3 more

do nively against promoted Pikemen.
But yes, Military Science comes near juicy techs (printing press, steel)