You need to know how to care for your Ragdoll cat or kitten before you bring one home. Do some research to see if it's even the right cat breed for you. Something really nice about the Ragdoll cat breed is that they are known for having many health problems like some other breeds. Just as long as you feed them right and they get their exercise, they can live up to the high teens or maybe even 20 years!
Ragdoll cats, like Siamese cats have a sensitive stomach so finding the right cat food that agrees with them is extremely important. Going into the pet store and picking out the most expensive or the cheapest food is not going to work. Many pet stores have breed specific foods, that would be a good option for your Ragdoll. You could even take the route of making your own after you find out what agrees with him or her. This way you know exactly what's going into their body and you can modify it if need be.
I suggest to anyone with cats to leave some cat toys laying around the house so that when you are not around or able to play with him or her they can entertain themselves. Cat trees are a great option as well. They need lots of love, attention and playtime with you so don't deny them of that. This is all they have so be loving and loyal to them and they will be the best companion you could ever ask for.