OP, congrats on the house!
You need a lot more self education. Seriously. Because if you have gas service, then yes, you have something that runs off gas. Do you really want to find out that it's the heat when the temp drops? On the other hand, if you don't know if you have gas service to the new house - you need to find out.
Basic things you should know/find out very quickly on ANY house you own:
-What your utilities are and what runs off of them. IE, furnace, water heater, etc.
-Where and how to turn off the water to the house
-Where and how to turn off the gas to the house (less likely needed, but still good to know)
-Where the electrical box is, how to turn off the power, and how to reset breakers if they trip
-What regular maintenance is needed on major systems. This is mostly going to be your furnace/ac filters, but if you have a well, water filtration of some sort, etc that also falls into this bucket.
-How to turn on and off the heat and A/C
Longer term, you're going to want to hunt down where all the GFIs are because at some point one's going to trip and it's good to know where they are to check them all.
Your home inspector would likely be able to tell you much of this stuff during the inspection. If you've missed that opportunity you'll have to work a little harder but it's completely doable.