As you are probably extremely aware, taking the first step is always the most difficult step, and more than often we need a little push. To learn the guitar online is no different. Think about it this way, you have gotten on a train on your way to a job interview, not just any job, the job that you want. You know it can totally be done, but after you get it, you dont want to let it go, so you ask the people that has had this job in the past for advice on how to do it.
Now that you have chosen the guitar as the instrument that you will learn how to play, it is only time to find out what is the best path for you to follow.