Based on the Marvel Previews #6, February for April 2016, I'd say you need to pre-order the following books in order to keep up with Spider-Man.
Amazing Spider-Man #1.5
- Cover By Simone Bianchi
- Variant Cover By TBA
Amazing Spider-Man #10
- Cover By Alex Ross
- Civil War Variant Cover By TBA
Amazing Spider-Man #11
Marvel Universe Ultimate Spider-Man: Contest Of Champions #2
Spider-Man #3
- Cover By Sara Pichelli
- Variant Cover By TBA
- Civil War Variant Cover By Mike Perkins
Spider-Man 2099 #9
Spider-Man/Deadpool #4
Spider-Man & Silk: The Spider(Fly) Effect #2 (Of 4)
Spidey #5
Reprints
Spider-Man 2099 Vol. 1: Smack To The Future TPB
Spider-Man By Todd Mcfarlane Omnibus HC
Spider-Man/Deadpool Vol. 0: Don't Call It A Team-Up TPB
Spider-Man: Brand New Day -- The Complete Collection Vol. 1 TPB
Web Warriors Of The Spider-Verse Vol. 1 - Electroverse TPB