You just do one a day. Also I did not make this I found it on Tumblr.
link

Day 01: Favorite Doctor
Day 02: Favorite Companion
Day 03: Your Least Favorite Companion
Day 04: Favorite Villian
Day 05: Favorite Alien
Day 06: Favorite Special Episode
07: Favorite season
Day 08: Least Favorite Season
Day 09: Favorite Master
Day 10: Saddest Episode
Day 11: Funniest Episode
Day 12: Episode That Scared You The Most
Day 13: Favorite Theme Song
Day 14: Character You Like That Everyone Else Hates
Day 15: Most Annoying Character
Day 16 - Favorite Actor
Day 17: Least Favorite Actor
Day 18 - Favorite Actress
Day 19 - Least favorite actress
Day 20 - Favorite Writer
Day 21: Favorite Couple:
Day 22: Favorite Friendship
Day 23: Favorite Doctor Who Spin-off
Day 24: Favorite Quote
Day 25 - Favorite Doctor Catchphrase
Day 26 - Favorite doctor gadget
Day 27 - Favorite interview
Day 28 - Favorite gif
Day 29 - Favorite guest star
Day 30 - When did you become a fan of Doctor Who?