OfficeMax has any potential applicant apply online through their website. The online application doesn't take more than an hour to fill out, so its nothing out o the ordinary. It mostly asks for prior experience, current job status/education status, and the like.
After they receive your application, a store in the area you applied for will call you in about a week. Depending on the store, it may help to call them as well, just in case they've been busy. From here, the store manager interviews you, which consists of a variety of questions determining how you work with others, your overall flexibility, trustworthiness, etc. If the manager decides to hire you, you'll be subjected to a background check and drug test, which takes about 72 hours for the results to come in. At this point, you'll also be given final terms to agree to (salary, hours you'd be available to work, and so on).
The whole process is fairly relaxed, although it is obvious that you should take it seriously, as it is a job application, after all.