The 13-challenge, in the Writing Challenges is a great place to start. In one read, you can get 15 stories on the same plot, a great way to see the differences in style and voice, and the changes that come with starting a story with another scene will do or another POV. Also the mistakes we make in our first 13 are generally speaking carried throughout all of our writing.

13-challenge quickly explained:

Every Friday a new story synopsis is posted. And you have til Wednesday to post your 13 line take. Thursday morning the voting begins and continues through Saturday.

PS – You don’t have to write a 13 line to critique or vote. So, if you wanted, you could start today by voting and critquing at the Writing Challenges Section, The 13-line Intro's for Week Three,