I would take three of those PFD's back to the store.
I find three people in a small boat to be anything but enjoyable fishing.
Or, at least, put three of them in the garage. Two people on the boat, three PFDs. One as a "throwable" just in case. If you bought one of those 6 packs, the orange, blocky ones ... put those in the storage boxes. Buy some inflatables (or vest types) that you can wear all day. I'm not saying you have to wear them all day, but those are the kind you're more likely to wear while underway. Very few people are comfortable with the orange ones. They're flotation ... not comfortable.
A big crowd at a party might be okay ... a big crowd on a boat is a disaster waiting to happen. You can't be too cautious on the water.
Friends might wan to go out on it with you ... but you have to say, "No" ... or "Next week" when too many want to go at once.
I know you're eager to show off your boat ... but sit back, relax and get into it slowly.