Ah, in my opinion this is a fun match, mostly because Falco is kind of a Dedede counter.
He has a CG, so watch out for it. Lucky for you, it only works up to 50%. CG -> Dair spike from a low percentage is a big possibility, so keep on your toes.
You're gonna want to use your Dthrow as a tech chase. If they roll away, you dash attack, if they roll towards you, Dtilt, if they stay where they are, Fsmash.
You want to keep a Waddle or two in between you and him to soak up some lasers, and I think Ftilt cancels lasers, so you can approach that.
I suppose it would be best to keep at around mid range, enough to Ftilt him, but not too far or else he'll laser spam you until you approach.
Those are just some general tips, some can be a bit risky, though, so test things out before you bring them to tourneys and the like.