It wasn’t until the 18th and 19th centuries that the tarot was taken up wholeheartedly by occult and esoteric societies for use in divination. A Swiss clergyman named Antoine Court de Gébelin wrote a treatise called Le Monde Primitif (The Primitive World) which connected the imagery in the Marseilles tarot to the mysteries of Isis and Thoth, thereby forever linking the two. (Aleister Crowley would later take this up in his creation of his own Thoth deck.) De Gébelin made many assertions regarding the connection between the tarot trumps and Egypt; these were later debunked by Egyptologists.
Over time you must build up a relationship with your spirit guides. Your purpose in life is changing, and even if mediumship is only a hobby, your spirit guides need to adjust. Often-times you'll have a lead spirit guide who guides you the most in every day life and ensures you're staying on track according to your life plan if you have one. Different spirit guides preform different functions, for example, if you're an artist you may have an artist spirit guide who helps you while you paint. You may also have a motherly guide to help you in parenting and a business-minded guide for running a business. These are guides with certain expertise, learned during one or more previous lifetimes.
After drawing your cards, revisit your initial question to ensure that it has been addressed properly. A good tarot guide can help you interpret the images you see on the tarot cards, but there’s really no substitute for personal reflection. As with any skill, practice makes perfect, so use this tarot tool often (daily, if possible), or order a set of Astrology Answers Master Deck Tarot Cards and practice at home!