The simplest way to install rv solar panels is to pay someone to do it for you. In this case you don’t have to worry about anything. Another option is to buy RV solar panels in a kit kit, in this case all you have to do is to screw stuff together.
You also can do everything by yourself to save even more money. You can either get a ready solar panel, in this case prepare to pay about 3-4 dollars per watt, thus 100W panel will cost you about $300. So, where to buy solar panels? Ebay and Amazon probably are the best places to buy them from, since you have a lot of variety and can compare prices from different sellers, Amazon is also fine, they are famous for their low prices. You can buy residential solar panels there too, since there is not much of a difference between RV and residential system except of mounts and extra inverter.
You can make a panel yourself, in this case you will probably pay 1-2 dollars per watt. You need to get solar cells (lots of them are sold on Ebay and Amazon), solder them together and put in a frame. Building your own solar panel topic is beyond the scope of this website, you can find a decent guide in Internet or buy some cool book, where everything will be explained for you.
For novice the best bet would be to buy small solar panels first to try them out. It is easy to increase your solar panel wattage later, just add few more panels.