yeah that dose will be fine, dbol is a fast acting drug so even if the worst comes to the worst and you dont get on well with the side effects it will be out of your system (sides wise) in approx 24-36 hours after you stop taking it
nolvadex is a POM (prescription only med), primarily used in women with breast cancer to block estrogen, so your need to get it in the same way you got your dbol, its only cheap though
i wouldnt risk starting it til you have all your planned pct meds at hand in case you struggle to get them (you dont want to start getting bitch tits and not be able to get any

)
remember to up your water intake to around 2-3L per day, aim for 4000 calories, 35g of protein every 3 hours PLUS protein shakes and DONT drink any alcohol as dbol is hepatoxic