Online selling etiquette

I put some stuff up for sale, it's a bunch of items that all work together, so selling it as a lot.

Put the stuff up last night before going to bed.

This morning I have three responses.

First guy: interested, send me a pm, I'd like to come see what you got.

Second guy: I'm interested also.

Third guy: I'll take it all, I can be there this afternoon, when can I come, my number is ***

Typically I would respond to the the first one who responded to my ad. This time I replied to the third guy cause he was the first to just say "I'll take it all, when can I come".
Did I do right? Or would you have responded to the first guy first.

Just curious

The first one with the money on your doorstep gets the Winner Winner Chicken Dinner.
If it's here on the forum, I go with who responded first.
Unfortunately nobody responded for MONTHS when I was giving away some 1991 truck 360 manifolds that I bead blasted, so they went in the trash.