The very first thing that you will need is your clothes, or “soft” kit. These define the person you are trying to portray. It is important to keep this person in mind as you are getting your kit put together, as many aspects of what you wear speak volumes about what your job is, how wealthy you are, where you come from, etc.
That said, it need not be difficult nor overly expensive. A person with even mediocre sewing skills can put together a kit for around $100. On the other hand, if you buy all the pieces, one can have an authentic soft kit for $450. Many choose to make what they can and purchase what they can’t.
Every new member starts with a commoner’s kit. This is not only easier and cheaper, but to realistically portray a member of the Gentry, you will need to recruit others to act as retainers in your household.