I went to a 141 school so my costs may not be representative of what you will pay going to a part 61 flight school, but my Private Pilots License cost just shy of 12,000. If you really want to be a pilot, start saving. With regards to your medical, as long as you can see 20/20 (with or without glasses), aren't colorblind, aren't deaf, aren't on any medications, and are just generally healthy you should have no issues getting a third class medical. Once you have your license, most flight schools will allow you to rent their planes. Buying a plane is an option if you fly a lot. Buying the plane itself isn't that expensive (look around on trade a plane and you can find old 172's for about 20,000) but the insurance and maintenance is.
If the cost of it all hasn't scared you off, you could start studying aviation weather products:
http://www.faa.gov/documentLibrary/media/Advisory_Circular/AC-0045G_chg1_fullDocument.pdfVFR sectional charts:
https://www.faa.gov/air_traffic/flight_info/aeronav/digital_products/aero_guide/media/Chart_Users_Guide_12thEd.pdfand applicable regulations to student and private pilots in part 61 and 91:
http://www.ecfr.gov/cgi-bin/text-idx?SID=d0a2d54505ca8a3733cde8be6b72effb&tpl=/ecfrbrowse/Title14/14cfrv2_02.tpl#0The Pilots Handbook of Aeronautical Knowledge is a good book to guide you through most of your initial training:
http://www.faa.gov/regulations_policies/handbooks_manuals/aviation/pilot_handbook/and the Airplane Flying Handbook is another good publication to teach you the basics of actually flying a plane:
https://www.faa.gov/regulations_policies/handbooks_manuals/aircraft/airplane_handbook/Don't be overwhelmed by all that stuff I linked to, you don't need to know it all before beginning your training. Your flight instructors will teach a lot of it you you while you are in training and a lot of it will make more sense when you actually start flying. With that being said, the more that you can learn before you begin training will make everything a lot easier and save you money.