Hi There!
A very exciting stage to be at. My own tuppence worth:
1. Court potential supervisors - focus on individuals who will be great to work with and have research interests closely aligned to what you want to do.
2. Funding can be a tricky one (much depends on which country you're in) - but always a good one to discuss (at a little later stage) with potential supervisors. If a potential supervisor is willing to sponsor and fight your corner with the university, you stand a much better chance of success, in my experience.
The big question is are you in Arts/Humanities or Sciences/Engineering? Funding is a bit more free flowing for the latter, in general.