Hi and welcome to the forum. I would first check if the caravan has been serviced within the last 12 months and if not have this done to make sure it is safe for the road and the gas and electrics are working correctly. The caravan does need checking every year as your safety depends on this.
Cleaning is very much the same as your car outside but do not use a high pressure hose as it can damage the sealant used to join the panels. Inside again it is similar to your house.
Towing is fairly straight forward but do be aware that the caravan does cut in on slow corners so you have to take them a bit wider than with just the tow car. Watch this in the mirror to see the effect until you do this automatically.
When it comes to hitching, pitching and the like I would look on you tube as there are plenty of videos on there covering this.
If you have any further problems please let us know, just about every problem has been met by someone on here at some time.