How can I set up a Facebook account?

You go to the Facebook web site and follow their instructions.
Have you tried to start one and had a specific problem?

As well as go on Facebook setting & read their guidelines where you can follow are instruction to set your account settings
To avoid spam and giving your contact information to everyone, consider setting your contact details to private.
Some Facebook users prefer not to be found when others do a search. If you prefer not to show in the searches, you would want to adjust these settings to remain private. You can also create private groups of friends that have certain privacy settings.