To answer your question, but not with detail "how too's", you need these 6 things.
1) A place to park the camper
2) Hook-up to electricity
3) Hook-up to water
4) Hook-up to sewer
5) Propane in the propane tanks
6) A working battery
Assuming #1 is met...
You need to determine if your camper is a 30 am or a 50 amp camper for electricity. Most likely it's 30 amp. You (can) plug into a house outlet (15 or 20 amp), but you are greatly reducing the amount of electricity you can use to run everything in the camper. Yes, you will need the appropriate electric cord to connect the trailer to "shore power".
Next, you need water. RV all have fresh water holding tanks and they all have built in water pumps to pump the water from the tank. You fill the fresh water tank and turn on the pump. The pump runs with the faucet is turned on and shuts off when with faucet is turned off.
Your camper will also have the availability to run totally on "shore water" without using your on-board water pump or water tank. You simply connect a garden hose and leave the shore water faucet turned on keeping your water lines in the camper constantly under pressure.
You will need a way to remove waste water from the camper. You will have, at a minimum ... 2 holding tanks (maybe 3). The toilet dumps into a separate tank called a "Black Water" tank. The sinks and showers drain into a separate tank (or tanks) called "Grey Water" tanks. You may have 2 tanks or 3. (Kitchen / Bathroom sinks - bathtub AND the toilet)
There will be a minimum of one discharge pipe on the outside of the camper. (There may be 2).
If only1 discharge pipe, then there is only 1 grey tank and 1 black tank, and both drain to the same outlet. There will be two pull valves, one for each tank. A black handled valve should be the black tank, a silver handled pull handle should be for the grey tank.
If you have 3 tanks, you'll still have the same configuration with black and grey coming together, but you'll have a 3rd valve and a second discharge port for the kitchen.
Regardless, you need a way to get rid of the waste water. You'll need RV sewer hoses, no matter how you get rid of it. If on a full hook-up site, you'll attach one end of the hose to the discharge port on the camper, and the other end goes in the sewer pipe. You will need an attachment to hook-up the hose to the campground sewer. Depending upon what the campground has will determine what type of connection you'll need.
If you do not have full hook-up, you'll need a way to empty your tanks with either an RV tank service or a portable "tote" to transport the "stuff" yourself to an approved dump station. Never, never, never dump anything on the ground unless you are on your OWN property that you own! And the black tank should NEVER be dumped directly on the ground, even on your own property. AND it is against the law in every jurisdiction to dump into a city storm drain! NEVER, NEVER do that.
Your camper will need propane, and good tanks are vital. Check the date codes on your propane tanks and make sure the tanks are not expired.
Your refrigerator may be a 3 way or a 2 way refrigerator, if it is not a "residential" refrigerator. A 3 way refrigerator can be run on Battery, Propane Gas, or AC electric. 2 way is gas - AC electric. Residential is AC electric only.
Your furnace will run on propane only, but requires DC electricity from the battery to function.
Your water heater will most likely be Propane and possibly Propane-AC electric. But no matter what, the circuit board in the water heater runs on DC battery.
And that takes us to the DC battery. Without a functioning battery, the DC electric "stuff" will run exclusively off the camper's converter (IF you are plugged into AC shore power electricity). Otherwise, everything in the camper will run off the battery only.
Those items that run on DC power: water heater, refrigerator, furnace, CO detector, the campers music center (stereo - radio), house lights (the ceiling lights), slide-outs, electric jacks if you have any.
Microwave, wall plugs, television, air conditioners all run on AC shore power electricity, not the battery.
I know this by itself is a LOT to absorb and these things were probably never made clear to you. But, don't loose heart. It's OK to ask questions on this and other camper/RV related forums, just simply ask one question at a time, and it's OK to make several at one time, just do them separate. This saves a lot of confusion and ensures a specific matter gets addressed and does not get lost in a multitude of responses that cover every topic, except the one you really need. So, each question make it a new post.
As stated above, YouTube is your friend. Take it all one step at a time. Do a simple search, like ... RV set-up for newbies! or something like that, then work your way through. You'll need to make adaptations for your specific camper and no two of them are set up exactly the same.
And yes ... sticker shock has probably hit you. RV ownership (of any type) is not a cheap way to live. Count the costs carefully and keep a detailed record of everything you spend. You may find it is too daunting on your finances and decide to pursue another course. If you do, that is OK too. There's lots to learn, and lots to spend money on.
I wish you great success. Don't get overwhelmed, just take it one step at a time. And you've already passed step 1 and 2 ... you have the camper and you are now asking questions.
