Let me give you some advice, since a couple of months ago I was on the same position as you are now.
I started to sharpen knives using a coarse/medium combo silicon carbide oilstone that used to be my grandpa's (it was over 20 years old, accordig to my aunt). So I decided it was time to get some newer stones (specially considering it is broken in one side, and have a hollow as deep as a dale carved on it...). Well, I live in Brazil, and getting benchstones here is as hard as getting cow beef in India. For some reason, the only stones availabe in the marked are cheap 120-220 grit that do more damage than honing (after a few strokes you can notice a few sand grains, holes, and all sorts of defects). So, I decided to order some from USA. I had no clue if I should order waterstones or oilstones, or buy a sharpening system like edge pro or wicked edge. After a few months reading about it and playing around on online shopping sites, I bought a set of oilstones and a set of waterstones, some green compound and a double sided paddle strop. I spent roughly 600 dollars on everything, and I managed to ask my uncle who lives in USA to bring them here two months ago when he had planned to come and visit us. If it were not for him, I'd have spent 600 dollars more on shipping and customs.
So after testing both waterstones and oilstones, I concluded that the oilstone kit I bought was much easier to use for a begginer like me (cuts faster and does not require much technique). Also, I got a great deal of two combo stones plus a strop and compound for 80 bucks. So if you want to give it a try, I HIGHLY reccomend getting this oilstone kit for 80 bucks, it is great, and unbelievably cheap for the value. I bought it on sharpeningsupplies.com on this link:
http://www.sharpeningsupplies.com/Ultimate-Oil-Stone-Kit-P320C100.aspx
Also, consider getting a coarse/extra coarse DMT diasharp combo stone (actually not a stone, but a piece of steel with diamond glued on it...) for some heavy duty.
And that's it. You should cheer that you're in USA and have fun trying out everything you can until you find what you like. But if you want something cheap and great for a begginer, go for the kit I mentioned.
Regards,
Zepp