Based on the Marvel Previews #36, July for September 2015, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Core Titles
Amazing Spider-Man: Renew Your Vows #5
Amazing Spider-Man: Renew Your Vows #5, variant cover Joe Quesada
Amazing Spider-Man: Renew Your Vows #5, variant cover Nick Bradshaw
Amazing Spider-Man: Renew Your Vows #5, variant sketch cover Joe Quesada
Marvel Universe Ultimate Spider-Man: Web Warriors #11
Spider-Island #4
Spider-Verse #5
Spider-Verse #5, variant cover TBA
Guest Apps
Ultimate End #5
Spin-Offs
True Believers: Spider-Gwen #1
True Believers: Silk #1
Reprints
Amazing Spider-Man Vol. 5 TPB
Avengers: No More Bullying TPB
Miles Morales: Ultimate Spider-Man Ultimate Collection Book 2 TPB