Everything you need to know is in the HRT/T replacement forum. Please read the stickies there by KSman.
I am in the UK and I now do HRT/blast and cruise (am in my second year)
This is what I do-as per KSman and BBB's recommendations...
250IU HCG E3D to maintain testicular size and function and also in case I ever decide to have children.
Test: Whilst cruising I'll do between 200-300mg per week, whatever is easiest, my Cypionate is dosed at 300mg/ml so I do 0.5ml E3D and obviously more when I am 'blasting' though I have gone as low as 100mg a week with .5mg adex a week.
Adex: whilst on HRT I understand the idea is to keep E2 in the low range of normal whilst having test in the 'max' (or slightly over max LOL) range of normal. KSman recommends, if my memory serves me correctly 1.2 mg Adex per 250mg test, split into at least 2 doses. I was using .5mg adex per 100-150mg test with no problems. I am using 1mg E3D now whilst on 400mg test a week and was using the same on 600mg, but have gone up to 1mg EoD whilst on 900mg a week which may have been a bit too much (adex, not test LOL)
When I make the transition from blast to cruise, the HCG obviously doesn't change, I just start shooting up 100-150mg E3D and lower the adex about 7-10 days later according to the half life of what I'm taking. Its good to get into the habit of injecting E3D or however frequently you want to inject, I keep a little diary so I don't miss a day or do a day twice.
I hope this helps, I know I have deviated slightly from KSmans advice in that I don't split my Adex or test into 3 or even 4 doses a week, although I understand with Cyp I still have stable blood levels so I don't see it being a problem.