Start the adex low (0.25mg/EOD) and adjust from there. I've found I need 0.5mg/ED to combat the bloat from Test E. I've not experienced any kind of libido crash at all.
In the end, adex dosage seems to be a very personal thing and based on a whole bunch of factors. Don't stress it and tweak as you go along.
Most people will tell you to wait until you get sides, I just err on the safe side and run it from the start (Also I ran dbol as a kickstart).
With regards to being a little higher in bodyfat and adding mass; I'm an endo and find I have to have cardio in the mix (currently doing 30 mins every day despite 'massing'). Fasted morning cardio helps me keep bodyfat down whilst keeping cals high and gaining mass. If it means anything, I do stationary bike @ 130BPM x 30 mins. Fast walking may be a better option but the gear gives me insane shin pumps!
Post up your diet and let people chime in.
EDIT -- As Game_over says, 200mg isn't much but will shut you down. 400-500mg a week would be ideal for a first cycle as many people will point out but again, I'd start with a look at the diet.