Fill this form diligently. This year we are gathering a bit more information about proposals than in the previous years. The goal is to raise the quality of proposals and get a better agenda as a result.
This example proposal from PyCon in the North America might be helpful ->
https://us.pycon.org/2015/speaking/proposal-resources/Also this guidelines/tips more or less apply to PyCon PL ->
https://us.pycon.org/2015/speaking/proposal_advice/Keep in mind that in PyCon PL case all the proposals of talks/workshops will be anonymized, so the Program Committee won't have information about the author(s) of proposals when doing reviews.