As with any new hobby, no one expects you to have or know everything. You are getting started; everything will improve the longer you participate. If you need to borrow items, especially garb, from the Chatelaine, contact them in advance. They can assist you either beforehand or at the event.
The information presented here comes from SCA 101: How to Plan, Play, and Avoid Dismay by THL Anóra Tryggvadóttir and from pages 13 and 14 of the article “A Newcomers Guide to the SCA“.