The 'Let me play' teams are a totally different entity to the Facebook teams.

It's possible to play on Facebook through the PC and then at a later date connect to this team through your phone, but in response to 1) no, it'll reset and create a new team with a Facebook profile.

In response to 2) I'm actually quite unsure on this - I assume that a small part of the data is stored on your phone, but your profile is also stored on the game servers so it's a strange one - drop a mail to Nordeud Support and you'll have your answer soon enough