The first time I did oxy it was 15mg up the nose(half a roxy 30), and I was faded and I was also completely naïve to opioids like you.. It only lasted like 2 hrs tops, then I did the other 15mg and was good, really good, too good, then addicted to the feeling and never looked back. I definitely understand the low doses though, oxy is dangerous to the opiate naïve if taken at too high a dose. It is relatively fast acting in the form of percocets though, like I would always start feeling them about 10-20 mins after I swallowed them, about 10 mins max if I chewed them... which I normally did. You might be one of those people with a naturally high tolerance to oxy too and need more than 10mg your first time with oxy.. Like invisible helper posted, just keep bumping it up around 5mg at a time and wait a little bit to feel its effects, and if still feeling nothing take 5 more mg... and so on.. just be careful not to over do it, which can happen, especially with zero tolerance. Hope you figure it out. But best advice I can give you is if you do not need these for pain like some people and are just taking them to get fucked up, stop after today and never look back.. Oxy addiction is no joke, it got me hooked from the first 30mg I ever did and I didn't stop.. then went on to heroin eventually, and every other opiate pharm there is as well (excluding fentanyl)... And finally to where I am now which is buprenorphine opioid replacement therapy/maintenance.. now I am addicted to subutex and cant get off that.. So this shit can start real small with something as tiny as 2 5mg percs and turn into a disaster real fast. BE SMART AND BE SAFE!