There is no rush to breed Dixie since she is still a baby. Go ahead and wether the buck kids. When you have time and want to breed Dixie, contact her breeder and ask about stud service. The breeder can probably put you in touch with someone who will provide registered stud service.
Since you bought Dixie to show, she does not have to be bred until she is 1 year old. She will freshen as a 2 year old. She can show as a kid and then as a dry yearling until she is 2. At 2 she has to be in milk to show. Since you bought her to show, you want her kids to be registered.
You can't show her daughters unless they are registered. There is no reason to keep any sons from her. You already have several pet wethers, and if you are sincere about showing you should only be keeping daughters and granddaughters since they are all you can show. Goats tend to multiply rapidly and are fun so be careful about how many wethers you keep as pets if you plan to be showing. Does are wonderful pets too, and can all be shown in various classes. Once Dixie has several daughters you can also show her and her daughters in Herd class, and in Produce of Dam class, as well as in the various age classes.