How to change the oil and clean the air filter on a 1999 ford fiesta?

im 17 don't no loads about cars, its my mums car bought it a wile ago it wasn't looked after AT ALL. its done 68,000 miles and i don't think its had a service at all and at the moment cant afford it so thought i would do it myself but don't know what tools i need and how to do the job.
Update: by the way its a 1.25 zetec engine.
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