Exercising the lens focus ring and the camera's shutter will sometimes help, but don't expect a miracle. One simple thing you can do to work around the stiff focus ring is to set the focus at some known distance, and place your subject at that distance. Fun and challenging at the same time.
I would not expect the shutter to be precise in the timing, but your first roll can give you some valuable feedback. Take notes on the exposure of every frame to help you analyze the performance of the camera when you get the film back.
Speaking of roll, if the box doesn't have suggested settings printed on it, and if there is no sheet of exposure settings inside, simply note the film speed (ASA or ISO) and go online to get the correct exposure. Use daylight as your testing light and the settings starting point. Sunny day, but no glare.
A good, fresh, daylight film is what you want. Probably for color prints, although color transparencies or b&W will work for the testing. Pay attention to the expired date on whichever film you buy. Take the exposed film to a reputable lab for processing.
Often, the lab will make adjustments to the exposure and color when they make the prints, so look at the negatives to judge whether your camera is exposing the film correctly.
Do not oil anything inside the camera or lens. If everything works except for the stiffness, ask a local repair shop to tell you how much they will charge to clean and re-grease the lens focus ring. Don't try this yourself unless you just want to see what's inside. You will probably not get it back together correctly, so take it apart only if you're going to junk the lens anyway.
Oh, I nearly forgot to mention that older lenses can be purchased inexpensively, so it would be easier and less trouble to simply find another lens like it that works properly.
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