New owner of an '09 with some issues

[SilentMatt]

Hey everyone,
Just picked an '09 Aveo5 SS with 122k on it for $800 because it has a blown head gasket.
The previous owner was a lady with two kids that completely trashed the interior(needs a very deep cleaning). A bear also tore up the backside of the passenger seat back...

The po's boyfriend said that the CEL came on and he found oil in the coolant tank and an external oil leak so they stopped driving it.
I found no coolant in the oil and the engine sounds and runs fine(only drove it on and off the tow dolly).
I borrowed my brother in-law's code reader but it won't connect to the ecm. It powers up and tries, but says no supported functions.

I'm hoping I can throw a gasket in it and have a decent daily driver. I'd like to upgrade the suspension and tires because if it isn't fast, it should at least handle.