On the Comey-Russia thing:
I doubt there's much going on between the Trump campaign and the Russians. Most likely the Russians wanted to undermine Clinton and Trump wanted to beat her, but I doubt any real collusion. People in Trump's campaign might have been more aware of Russian hacking than the general public, but I don't see them colluding.
As for the firing, I'd expect an investigation but the major effect will be a continuing distraction from other issues, no impeachment or anything similar. Trump had the authority to fire the FBI director, however poorly it was handled.