What architecture are you thinking? Since performance isn't an issue, are you planning on doing a soft processor(Nios II) on the FPGA. How do you plan on having the FPGA and PC communicate? Will the PC do anything besides be a dummy terminal, or will it have smarts too(like graphics rendering based on FPGA commands). What language/s do you like, VHDL, Verilog, Schematic, C, etc.
I'm assuming this is an assignment. You're really going to have to define what you know, what you're experience is, and what plan you have, as the question right now is really too general to answer. (It's like saying I'm planning on building a house, so what steps should I take...)