Please make sure your proposal contains all the sections mentioned by the general guide for applicants. Follow this guide for all sections except for sections 1.1 and 1.2 where you follow the specific guide for applicants.
Also include a pdf copy of a signed motivation letter (see the specific guide for applicants).
Please do not wait until the very last moment since if there are unforeseent delays in the sending process, the rules are such that proposals received after the close of the call cannot be evaluated. You are allowed to update your proposal right up to the deadline.