@janbb Get one with auto start, auto transfer switch, auto testing, battery backup, plumbed into your natural gas line. That is perfect. Don’t let them talk you into something too big.
Like @jerv said you need to power essentials. The rest is just luxury.
I’ve said this in another thread but it is worth repeating: my 1.1kW powers, my electric garage door opener, freezer, refrigerator, sump pump, thermostats, kitchen appliances and outlets for charging computers. Not at the same time, obviously, but It runs a loooong time on a gallon of gas.
A 5 kW would give you a lot of extra power to operate all kinds of things at home, if you are conservative. You’d be able to do laundry, turn on all your lights. watch TV, even use your hair dryer and iron. But not necessarily at the same time.
Seriously, think about adding a storage tank in case natural gas is turned off. That is the only reservation I have about natural gas power. I’ll bet there were more than few people on Barrier Island cursing the day they spent good money for that nice new natural gas generator that did not work because the gas was turned off. .