I should clarify, that when I suggested using stuff from the supermarket – I only meant the anti-flea floor spray/powder, not any stuff you put ON the cat! We're used various things generally with success, the vet's spray we bought didn't do jack sh**…
I've read some nasty things about the Bob Martin spot-on stuff, for sure make sure you use Frontline or Advocate & get it from the vets (or reputable online supplier).
Laser pens are the best toys – as someone says, you'll laugh your nuts off watching the cat chase it round at warp speed!
That, and a box/holdall. For some reason, they always seem to jump into them & play.