I recommend Unity3D for what you want to do, as it can do PC, Mobile and Web with the same game scripts so you won't have to rewrite after that.
Polish, test and release your games. Then, sell it for Windows 8 & Surface RT, Windows Mobile, and Android. When you make some money from them (by selling them in the respective App Stores), invest in a Mac Mini and iPod Touch (cheapest entry into the Apple world) and you've got a full studio for all the platforms you want to hit. One of the best ways to score Apple gear for less is to look at the Apple Store online in the "Refurbished & Clearance" link. You'll save 20% or more.
Wish you the very best. Writing and selling multi-platform games can be very fulfilling