First Grow Lights

For my first grow I don't wanna spend a lot of money until I get some experience vegging and flowering a couple plants first. For my grow cabinet could I do well lining the walls with spaceblankets? I heard that aluminum foil is a poor choice to use as they generate more heat or something. Also I don't have enough money to buy seperate hps and mh lights. Could I get away with flowering under cfls until I have enough saved up? I eventually wanna get a real grow light and an interchangable ballast for either hps or mh. For this first grow budget is the key. With a lot of TLC hopefully I can grow a respectable plant.

you can still grow decent bud with CFL's you just have to ..be a decent grower + have a lot of cfl's. check out humboldt's grow for example