These will help putting on the small components onto the PCB.
tape/kapton tape
This will be helpful to secure some components while soldering.
extra flux / flux pen
Extra Flux can be helpful when soldering. Flux makes the solder flow better into the cavities and generally helps get a good solder joint.
isopropyl alcohol / PCB cleaner
IPA or PCB Cleaner is super cool to make the PCB look good after you are done soldering.
brass sponge
With a brass sponge you can clean the tip of the soldering iron. A brass sponge is a small investement but surely a good one! It makes soldering that much easier when you can work with a clean soldering iron tip!