Start out by going to www.Facebook.com. From this page you will be able to create your own personal Facebook profile. Fill in your name, email, password, sex, and date of birth. Click 'Sign up' after you have filled in all of this information correctly.
Facebook will send you a confirmation email to the email address that you have provided. Log into your email address and find the email that Facebook has sent you. Click on the confirmation link in the email to activate your Facebook account.
You can now log into your Facebook account whenever you like. You can upload videos and pictures to share with your friends, and find people that you have not talked to in a long time. Who knows, you might even meet some new people on Facebook.