so I have a geo tracker 1.6 sohc and i want to turbo it. i need help

No you don't absolutely need an intercooler as long as the boost is low and there's enough cooling already. Some turbo cars come standard with no intercooler but you would want to add one if you ever play around with the boost. Like crushedcamber said, just take the intercooler that the turbo was originally attached to.
I would still add one though because the colder the air, the more power you get. Plus turbos can get VERY hot and can damage surrounding parts. Also, if you don't look after the turbo heat-wise it will not last very long.

You have a lot of cheap & easy options there. I'd probably look at getting one off a s4/s5 rx7. They're usually pretty easy to find & you can pick up one of their intercoolers for very cheap. They are small, light & efficient for running low boosts. Bear in mind that the s4 turbo has an internal wastegate, the s5 is external. Otherwise, any small displacement turbo off either a petrol or turbo diesel should do.

And as for the spring, you should be able to quite easily play around with the type of spring to get the psi that you are after. Or you can just pick up a small T-piece tap from any hardware store and use that to alter boost.

As for the oil, I'm not to sure how to do that one. Sorry

thanks SWE.

The only thing I can't figure out is the oil.
If i save my beans up I can go to the junk yard in the next few weeks and go 'pickin' as it were.

I would like to run under 10psi because of the age of the engine and such, luckily the Timing belt was replaced just prior to us picking it up so that shouldn't be a problem.

The intercooler is looking like a must as I usually go a bit slower through the woods and wouldn't want to cook anything nor fry the rings.

I have experience with 12v fans so hooking one up for the intercooler wouldn't be an issue as i wouldn't be putting it with the radiator due to not wanting to trade heat from one area to another. I already made a custom exhaust manifold for it 'or rather modified the existing one' for ground clearance reasons so adding a turbo wouldn't be an issue as it would most likely be mounted OUTSIDE of the hood just like the muffler

So any small turbo, where would I want to mount the custom 'waste gate' or would the actual impeller side of the turbo have a threaded hole for one?