Supra newb needs help bad!!!

[Supra_Sky]

ok so just recently my jetta got totalled. I got my insurance check and bought an 88 Turbo. I had an inspection done on the car by a shop just to back up my knowledge and they said all it needed was rotors and tires. Previous owner said he just replaced the HG so i did a block test just to make sure it wasn't blown. Talked the guy down on the price and decided to get it. I've had the car for about a month now. I noticed a week or so after i had it i had the waterfall coming form my dash. Did a flush on the coolant system, which looked like mud when it came out and the sound went away. As of now im having three seperate problems that i was wondering if they could be linked at all.

first, my radiator is still clogged i think becuase my low coolant light comes on every other day or so. What i believe is happening is the car is gettin hot and the overflow is spittin out the coolant, also my temp guage doesn't work so i don't know how hot the car gets. new radiator???

second after i drive the car for about twenty minutes and park i hear a bubbling noise coming from my block down by my turbo. if you take the oil cap off steam comes out of it. Is this my oil getting overheated due to the lack of a cooling system?

my third problem is the car usually won't start on the first try. If it does it tries to die right afterwards. Also the car runs extremely rough until it is actually drivin for a couple minutes, then its fine...

Any input/help/ideas are extrmely appreciated. I do not know hardly anything about these cars cause i have been a V Dub guy the past couple years... thanks!!!