welcome.

my biggest piece of advice is TRUST NO-ONE.
get your dad, or your brother, or your aunty...whoever knows about cars that you know PERSONALLY to work on it. even if it's a friend's brother's uncle or whatever - at least it's a lot more local to you that someone who runs a business and sees a chick who knows nothing about cars as a cashcow (please pardon the expression there...!).
next thing you'll need a recond engine coz your inlet manifold gasket has blown

and it's gonna cost you $3000 and a month of work.
seriously - TRUST NO-ONE.
and any supercheap or auto one or repco should be able to help you out with an air cleaner.
i would recommend a good oil (like Pennzoil) 15W-40 (or the regular 20W-50 if you can't find that.) but seriously, the stanza engines are bulletproof if you keep the oil changed regularly and use tannin based coolant instead of water or glycol based coolant in the radiator. tannin coolant is a little more expensive, but you change it less often and is less conductive to electrolysis.