LS-1 Malibu

Ive just purchased my very first LS-1 and it is going into an 81 Chevy Malibu!! I am going to build my own headers and since im doing that i just figured that would be the best time to install a turbo on the car!! I have never had an LS-1 or a Turbo! This motor is a 2001 that is all stock and i am wondering what size turbo i should run, what will i need to do as far as a cam and injectors and would i need to change the throttle body or would the stock one work for now?? Next winter im going stroker probably 408ci but for now just putting it in stock, with maybe the exception of a turbo!! Im very ignorant about the turbo setups so any info would help me tremendously!! Please dont tell me about all the kits that you can buy cause im going to build my own, a kit is just not in the budget!! ANY HELP WOULD BE GREATLY APPRECIATED!!!