There is no one answer here, it depends on your commitment, your expectations, your understanding. Where you want to go with it, your goals. You will need to learn respect, how to speak to people, what to say and how to say it. You are best off joining a group if you are serious, although this is not essential. Meditation is one of the best ways of developing your psychic gift.
Meditation is almost essential for helping to improve mediumship.
By learning about the Chakras , it's possible to close down our ' receptors ' so that we don't pick up things we don't need. This is a focus tool, much like Tarot cards and crystal balls etc. The difference is that it is used almost exclusively for contact with spirit world, rather than general psychic work. However, used in 'fun', by the inexperienced, or the un-protected it may attract spirits who would mislead and become difficult.