The filter will be "underpowered" IMO. I'd see if you can get your LFS to part-exchange it for a 305 if you want to stay with fluval, or better still switch it to Eheim or Tetratec. An EX1200 Tetratec would be ideal. Sorry, I can't recomend an exact Eheim, as I'm not well up on their models

Eheim are rated as the best exturnals available, but avoid the Ecco range and any thermo version, as these are dodgy

Fluval have a poor track record, usualy leaking and IME they clogg quickly and suffer channeling issues

Tetratec is my prefured brand, reliable and affordable
Ignore the step-by-step guide, instead read Miss Wiggles version in the pinned topic. It is somewhat better and doesn't miss some basics such as fishless cycling and the importance of leveling the tank
The Aquaplus is a water conditioner, so it will be fine. Cycle is a "bacteria in the bottle" product, that may or may not work to speed the cycle. IME this product doesn't work, and reports of such products actually working are rare. You may be a lucky one though and it may work, but I doubt it. It won't do any harm, so if it's supplied it's worth a try IMO
HTH
Rabbut