The official material should keep you busy:
TV
Spin-Off:
AUDIO
Doctor Who:
BF Full Cast: Main Range, Eighth Doctor Adventures, Dark Eyes, Doom Coalition, Fourth Doctor Adventures, War Doctor, Tenth Doctor Adventures
BF: Companion Chronicles, Lost Stories, Short Trips, Early Adventures, Third Doctor Adventures 1, 2, 3
BBC: New Series Audiobooks, Hornets' Nest, Demon Quest, Serpent Crest
Spin-Off:
BF Classic Who: Bernice Summerfield, Bernice Summerfield Box Sets, Dalek Empire, Sarah Jane Smith, Gallifrey, UNIT, Cyberman, Iris Wildthyme, I, Davros, Graceless, Counter-Measures, Vienna, Charlotte Pollard
BF New Who: Torchwood, Torchwood Specials, UNIT: The New Series, Diary of River Song, Churchill Years 1, 2
BBC: Torchwood Audiobooks, Torchwood Radio Plays, Sarah Jane Adventures Audiobooks
Other: Kaldor City, Faction Paradox Protocols, True History of Faction Paradox
PROSE:
Doctor Who:
Novels: New Adventures, Missing Adventures, Eighth Doctor Adventures, Past Doctor Adventures, New Series Adventures
Anthologies: Decalogs, Short Trips (BBC), Short Trips (BF)
Spin-Off:
COMIC:
Doctor Who:
Doctor Who Magazine: 4th, 5th, 6th, 7th, 8th, 9th, 10th, 11th, 12th Doctors
IDW: 10th & 11th Doctors
Titan: 12th, 11th, 10th, 9th, 8th, 4th, 3rd Doctors