If you are interested in basing your aircraft at Oshawa, investigate the following sources.  In general, there are few rental hangars available.  Tie downs on asphalt or grass are available.

Other information you should know:
There is a curfew.  If you are based at Oshawa, you may land after the curfew.  Advance permission is required for takeoffs.
There are a few restrictions for when circuits may be conducted (Saturday and Sunday: no touch-n-goes after 16:00, Long Weekends: no circuits at all on Sunday or Monday).  Advance permission is required, but this is a one time registration when you are based at Oshawa.

For details see the Noise and Traffic Management Policy.

There are maintenance shops and parts supplies available at Oshawa:
Copa70: Maintenance