As rightly said by Mr. Sai Kumar, you would need a formal degree/certification to kick start with HR.
While I was in my MBA-prep time, even my prof used to advice me doing full time over part time or distance mode. The advantage of doing a full time course is that you get a grounding, you get to share idea, you can participate in various events and contribute and can learn a lot about time mgmt and talent development, the most reqd thing in management.
I would still keep it to you if or not you wish to avail a full time degree course. If ur in Mumbai, Welingkars have s, 1yr diploma smthing in HR which you and enquire and weigh all pros and cons....
I can understand you've experience, but understand "experience" means "relative experience" which you dont have. Either you'll land up at a very low cost dng basic rec or if you need good job, pls do sm certification/course.
Hope it was of help :)