what is your tolerance to other opiates/oids? check out the opiate dosage converter in the OD Directory (link in my signature), that will give you a good starting point. remember the conversions are relative to analgesia.
you're straight up asking what's a good dose to get high which isn't something we cater to in OD so i'm going to close this thread. pm myself or the OD mods if you've got any questions on the closure.