If you do not frontload you need about 3-4 weeks before the total enanthate depot in your body levels out and your testosterone levels become stable.
The levels build up gradually and they are fairly high already after 1 week.
With a frontload of 3x the normal dosage you basicly reach stable levels in a matter of days.
If you plan to be going for 500mg Test-E a week you could inject 500mg EOD for 3 days. And use D-bol at 50mg a day for those first 6 days. The Test-E should take it from there. Thats a lot of juice during a short period of time. Be careful.
The Enanthate falls below suppressive levels 2-4 weeks after last injection.
I would go from 0 D-bol to 40mg a day during the week following my last Test-E injection, to compensate for the fading testosterone levels. Then do 1 or 2 weeks of D-bol at 50mg a day also using a proviron or arimidex to slowly cut out estrogen before PCT.
The switch to nolva during PCT for 3 weeks starting the same day I take my last D-bol.