The oil feed lines are not universal, they are different for each turbo. I got mine from ebay and if you wanna know who I bought them from I can go look it up for ya, they got here real fast and it looks nice. Only 60$.
You also don't need a fancy Wastegate, and internal one will do you fine unless you wanna go for lots of boost; but then if you wanted to do that, I'd say get off the budget...
You need to figure out what kind of ECU you have so you know what your options are for the fuel management, What car is this going into? I won't go into any more detail about fuel until I know what I'm dealing with, I'd just be wasting my words...
The turbos have Lots of dimensions, only 2 of them are major that you need to worry about. An exhaust A/r and a compressor Trim. The exhaust, .48 a/r should do you fine with a 1.8L and 50 or 60 trim compressor will be good for you. Garrett and turbonetics are good brands. Generally speaking the 'Cummins' brand are way to large, and the IHI's are too small, keep away.
A manifold that fits your b18... Goto ebay and type in 'b18 turbo' and see what you get. Other than that, goto google and type in 'b18 turbo manifold' an see what you get, most of them will probably be too expensive for your budget.
I would go with JC whitney piping, figure out what size your turbo compressor oulet has on it (ask the person your buying it from) and get the same size to run your charge lines.
The Charge lines are the intake pipes that go from your turbo to the intercooler, then from the intercooler to your intake manifold. You don't buy an intake like for naturally asperated cars, you're going to make it, if your not going to buy a kit. (and you probably aren't buying a kit; becuase making your charge lines isn't hard and it saves you money.)
You also forgot about exhaust, if you can't weld then your pretty much SOL, you're probably going to have to just take it to a muffler shop and have them do it, with all the turbo differences there probably wont be an exhaust that will bolt up, and to mention it, if there were, it would be out of your budget for sure...
You need to figure out vaccum hoses after all this other crap is done, you don't even know what your going to use that needs vacuum hoses yet...
Piecing togethor a turbo kit is no easy job, you aren't going to do it in a day, or a week. It's taken me about a month to collect all my parts, and its finally all coming togethor.
You just have to start somewhere and go, don't look back, I started by putting in an A/f meter that I made. Then I put in new injectors and screwed with those for a few days, now I'm putting in a Vafc and next comes the big equipment...
Buzz1167
Jon N
, gauges(egt, a/f, and boost). 
