initiation is done to welcome someone into a coven, so yes, you would need a coven.
a dedication is where you essentially introduce yourself to your deities, explain why you wish to follow this path, and ask to work with them. this one is personal and does not require a coven.
regarding a dedication there are a number of methods you may use if you wish to follow a pre-existing ritual, or make one yourself [some feel it's better if it's personalized because you're explaining your reasons and not reading off a piece of paper what you should feel] usually a dedication would be a cleansing of yourself and your space, circle casting, calling the Gods, introduce yourself, explain your studies and reasons for joining said path, cake and ale [offerings] parting, open circle. there can be more or less depending on your path and what you feel comfortable with of course.