Basically the only critical item that you need to worry about is the strata Insurance and that it gets paid and so you would have to set up a bank account and make sure all the owners paid their share (25%) of the insurance into it.
Everything else is nice to do (you would have to organise an AGM with a motion to approve the insurance quote as well).
This company
provide an online accounting service that you would update and can carry documents online that owners can access (bylaws, minutes, plans, etc) but I don’t know if they provide a service to self managed but our SM use them.