First of all, congratulations! I find it depends on the field, although there can be some variation within that. For example, my field typically interviews. However, like you, I received an acceptance last year without having had an interview. The people at that school told me they stopped conducting interviews because they felt the process was unfair -- that people who could not travel to interviews were at a disadvantage, so they stopped doing them. I think Master's programs especially may not interview as much.
Secondly, I think it is absolutely appropriate to ask about the financial aspect now. Write and thank them for the acceptance, tell them how excited you are about it, but say you may not be able to attend if you have to pay for everything yourself, and ask about funding.