You won't be able to acquire a community tax certificate (ak.a. cedula) here at this is issued by a local government office.

You don't have to prepare ITR since OFW salaries are non-taxable; unless you have an income-generating business in the Philippines then you need to pay taxes for those.

Registering a tract of land to your name while you're overseas will be very cumbersome if not impossible. My advice is to do it yourself.