Yes, there is a difference between working psychically and working with the Spirit. Simple, when you know what it is, but puzzling for those who do not.
Psychic awareness has to be developed in order to be able to communicate with spirits, though it is true to say that you can be psychic without being mediumistic.
To be a good medium, the psychic gift must be well developed and the ability to tune in to the spirit entities must be there. Not everyone has this gift. It takes years to develop properly and dedication is most important. It is not a game, nor indeed, entertainment. It is not a way to get rich quick, or in fact, get rich at all. If you wish to make big money then this is probably not the life for you.