30 mg of codeine and ~200 mg of tramadol is not going to have any effect on your tolerance when it comes to using heroin. Listen buddy, if you feel anything off 30 mg of codeine then you have no business IV'ing heroin, you proabably shouldn't even consider using it at all. We don't know what you are getting except its probably powder since you're on the east coast...realize some heroin can be so strong that a line that is about 1" long and 1/16th" wide would be enough to be risking an OD, maybe even less could do it. I'll give you an idea of my tolerance, I use about .5-1 gram of decent H a day, broken up into .1-.2 g lines. The heroin I get is not great, its very likely what you have will get in New York(especially in the city, if its a stamp bag) will be much stronger than the stuff I get up here in the Boston area. Now if I were to do 30 mg of codeine and as much tramadol as I'd be willing to do without thinking it'd cause a seizure, I am pretty sure it would have almost no effect on me. 30 mg of oxycodone will only make me feel normal. So for Christs sake, don't do heroin. You know 30 mg of codeine is like 3 mg of oxycodone, its nothing.
But in the event you insist on not listening to the advice of the knowledgeable people on this site, at the very least, judge the strength by snorting some first. And you should start with very small bumps. Even some of the most experienced heroin addicts do this, the ones who don't are often the ones who end up dead. You would end up sticking yourself 10+ times to determine a safe dose if you tried to judge it's strength via IV'ing, btw. And then you have to factor in the risk of getting a batch cut with some fentanyl and then your chances of dying are up about 10x, especially without having some experience with the substance.
Just to show you the danger, right now in MA there has been 53 heroin related deaths between dec 1st and 16th....thats over 3 a day....its insane. So just watch your ass, don't become a statistic.
I agree that it would probably turn out to be more pleasurable (not to mention safe) if you snorted or smoked it the first times. IV will just hit you like a ton of bricks and could result in a nauseous, paralytic type of high. I made the mistake of doing an IV shot as one of my first H uses, and didn't enjoy it as much as I could've because it was just too much. Whenever I'd move my head, I'd feel like I was gonna throw up any second. And jeez, it would be irresponsible to say how much of the balloon to shoot, since the shit's potency varies so much depending on where in the US you are and on your connect. Hate to see you fall out. Smoking can be a lot of fun. IV is best if you already have a habit, imo.
Sounds like you are talking about tar, he is from New York so almost certainly is getting east coast powder. So snorting is the only reasonable way to try this stuff out. Actually oral is a reasonable way to use it, honestly its a waste, everyone will tell you that, because its half as potent that way as snorting. You're not an addict, though, so you should have the main priority of safety and the 2nd prioroity of having an enjjoyable high, which is easier attainable when starting low,rather than shooting up and puking your brains out or even worse, falling out.