1990 Toyota Camry standard transmission 4-door has severe oil leak did oil change by 1 hour all oil leaked out now car won't start started to smoke a lil what do I do and what oil is needed to put in it and filter and how do I fix the severe oil leak problem?

This car has issues. Where in the country do you live? What's the vehicle mileage? Most likely you'd use 5w30 but this can change based on climate and mileage.
As for the exhaust problem, need to know where it's split. These cars will go through exhaust systems, and a car of this vintage may need a catalytic converter/ front pipe converter or worse yet a pre-cat which these older cars had. Black smoke could indicate partially clogged cats or other fuel issues.
Time to get the car in for service or look for a new vehicle. The necessary repairs may not be warranted unless the car is in pristine low mileage condition.

Need to find out where leak is from. Kinda sounds like a crankshaft main seal, front or rear of engine. Front one is pretty easy to change, but rear main seal leak means you have to drop transmission to get to it. But it could be another seal or gasket. Can you tell about where leak is, from oil spills on ground where parked? Look at engine. Is oil seeming to leak from bottom end or upper engine. May need to wipe or clean it off to see where fresh oil leak develops. A mechanic may need to put it on a car lift to pinpoint the leak. Good luck.

It means you could have a trickle coolant leak into a cylinder or cylinders somewhere if its white smoke. When the vehicle sits the accumulated coolant has to be burnt off when started and it smokes. During driving the leak at the moment is probably not big enough to be noticeable when its being burnt off by the engine. If its initially blueish\grayish smoke, then your rings are wearing

if you have bluish smoke coming from the tailpipe, then it is bad rings. however the valve cover gasket on toyotas tend to start leaking with age as well and if there is not much smoke, the oil may be leaking onto the exhaust tubes or down the ports past the spark plugs into the cylinder.

i suspect you are leaking coolant into the combustion chamber, it may be a head gasket, get it checked

air filtre also make sure your oil level is good check first thing in morning before starting car
to much oil can cause it to smoke

on the cylinder head ,u must check for the oil seals on for the valve if one of the oil seal leaks engine oil will come to the compression chamber,this oil burn and make that white smoke

automotive shops sell this stuff called honey. Its super thick oil that might slow down the leak. If the leak is coming from your oil pan try tightening the 10 or twelve small bolts around the oil pan. only go a half a turn on each so you dont smash your gasket or seal.

yea i had the same problem, my last mechanic didnt tighten the top where d sprak plugs go in so it was leakin oil all they way down to the bottom where the exhaust runs and was smokin because of that... had it tightned and no longer ne smoke

Considering the age of the car I'm guessing failure of the main seals or piston rings. Failing piston rings would give the exhaust a blue tinge and be most noticable when reving the engine in neutral (park). It would also show up big time during an emissions test. Leaking main seals would show up as oil all over the lower parts of the engine and transmission. If your valve cover(s) are leaking it will make it difficult to determine where the oil is coming from.
I have a '90 Camry and have leaking main seals. I'm down almost two quarts each oil change if I don't stay on top of it. Not much to do in either case but rebuild the engine ($$$$$). Hope this helps.