Vincentcadoret.com is friendly to iPhones and almost all modern smartphones out there. Watch this video to see how you could enable your wordpress blog to do the same.
1st: Get a Mac, you can't develop iPhone apps if you don't have a Macintosh.
2nd: Watch the latest Stanford course about iPhone programming (CS193P) on iTunesU and do ALL the assignements.
3rd: if you need more help, I suggest reading "Head First iPhone Development" or watching additional screencasts from Peepcode