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Help- stuck on GCSE ICT Spreadsheet coursework.....!?

I'm really stuck on my ICT spreadsheet coursework. My spreadsheet is meant to be comparing prices and calories between Pizza Hut and Subway (I don't have a clue why I picked those 2 restaurants to compare but I couldn't think of anything else to do my coursework on), but I don't have a clue what to do with my spreadsheet; it doesn't help that I don't know how to use any Excel functions (AND, IF, Max, Min.....etc). I'd really appreciate it if any of you could read through and give me some ideas on what to do on my spreadsheet. I've attached a plan which I've half completed, which includes identifying the user, analysing the software & hardware, designing the spreadsheet (including initial and final designs), testing it and evaluating the spreadsheet. I'd be most grateful if you could even give me some advice on how to use very basic Excel functions, like the ones mentioned above and possibly a few more (I'm no good with technology and software applications!).
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