[ZK] As it happens, both spellings are acceptable :-) As for the employment - are you seeking permanent full-time or temporary full-time or perhaps part-time, or just holiday work or support-yourself-through-your-studies work; days, evenings, nights, weekends or all four? C'mon gal, we need details!
"Hamster" is the correct spelling for the animal, yes. "Hampster" is a misspelling that caught on rather well and is therefore the de facto standard here ;-)