I have a 2003 isuzu rodeo, and the timing belt broke. its a 2.2l motor. I have no compresion and i think its the head. is there anything else besides the head that i need to be aware of when fixing my vehicle?

Don't condemn the head just yet.

When the timing belt breaks, the camshaft stops turning, so the relative position of valves doesn't' change if you try cranking the motor over. Any valves (intake or exhaust) that aren't fully seated will allow pressure to "blow by" that other wise would form the compression you say you no longer have.

What I'm not sure of is if you have an "interference" motor. An referenced motor is one in which the piston can strike a valve head when the timing belt breaks. The clearances are so close that all moving parts have to be in perfect sync in order to operate and not strike one another.

It is possible, with an interference engine, to break valves and / or crack a piston if attempting to crank and the piston comes in contact with an open valve.

If it isn't an interference engine, you shouldn't have any problems. Just get the cam and crank (and any other shaft(s) that may be belt driven) in proper timing, install a new belt, apply the correct tension and you're basically "good to go"

I'd suggest you purchase a vehicle specific repair manual at your auto parts store. It'll contain step by step instructions specific to your vehicle on how to perform this repair.

Good luck!