4-ad (4-Androstenediol) best product to buy and cycle?

I'm going to be stacking 
1-ad and 4-ad for 5 weeks and 6-oxo there after..
My question is i think i'm going to try this schedule..
1-ad = 600mg per day
4-ad = 500mg to 600mg per day
and 6oxo = 900mg per day post cycle

Is this a good cycle? Also i'm trying to get info on a good 4-ad to use.

Any help would be great..