Questions

 Wondering if you know?

1) How to get midi working on fl -

I don't use FL so not really.

Try:

• File> Import MIDI?

• Drag and Drop?

 2) How to load downloaded samples into massive?

Massive don't use no samples dude. It uses special wavetable- samples.
You can use Massive as an FX unit instead. So you can process audio through Massive. Not sure exactly how that would work, but I expect that you can control every aspect of Massive via MIDI.