Well, there is a gasket set on ebay here:
Ebay
You would probably also replace the timing belt, and possibly the timing belt tensioner at the same time.
You will need to know how, be comfortable with and have the tools to:
Torque the head bolts.
Align the timing marks and get the timing belt on correctly.
Set the tappet clearances.
Set the ignition timing.
get the rusty, seized exhaust manifold bolts undone and deal with any broken studs.
If you can handle that, go for it.
And yes, once you have the head off, you would take it to a machine shop for a crack test and resurface, possible valve seat grind and or valve guide replacement.
How much this costs will depend on what condition it is in.