Research your local laws regarding firearms and ownership. Be aware of local ordinances regarding transport and storage of firearms.
Ask yourself what your goal is for owning a firearm. Do you want something to defend a home? Do you want something you can keep on you?
Do you know anyone familiar with owning and handling firearms? If so, you should get in touch with them and express an interest in learning how to shoot a firearm.
Do you think you can be trusted with a firearm? If you struggle with suicidal thoughts, you should not own a firearm.