cool. Nice. My first car was an ST162. I had the ST which had the 3SFE engine. First thing you should do is change the oil and spark plugs. just to give yourself a good baseline so you know how the engine runs. they are pretty reliable cars but you may need to replace things such as clutch slave cynlinders, rear main seals (do the clutch while the gearbox is out), water pump, thermostat, starter motor, and maybe a few more wear-and-tear bits. you'll only need to replace them when/if they're broken though.
The 2nd gear synchro should be the last thing to replace if you're on a budget. some nicely time double clutching and Heal-and-toe should avoid the crunching for a while.
anyway, have fun with the celica.