What qualifications or requirements are necessary to start the practices of Heartfulness?

There is only one requirement, and that is your interest.

If you do it because someone else wants you to, it will not be as successful. This is true of any endeavor. Interest and willingness are key to success in anything. There is a saying that you can lead a horse to water, but you cannot make it drink. Try to force a horse’s mouth into the water and you’re bound to be kicked! Imagine trying
to force someone to close their eyes and meditate!