The most common types of injuries in a gym environment are going to be sprains, strains and twists to joints, muscles and ligaments. The more serious injuries will include things like broken bones, head injuries, lacerations / punctures or crushed limbs.
Even more serious injuries can occur, of course - but in general, you aren't going to be doing anything more in a gym environment than keeping the scene clear, stopping bleeding and doing CPR if qualified and the situation demands. First-responders and trained people might also apply splints and treat for shock - but any injury for which no trained person is present to treat should be reported to 911 immediately (especially head trauma, back injuries, broken bones or any loss of consciousness).
At a minimum, your gym's first aid kit should contain:
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