As far as WA Elapids go, start with the adders. A antarcticus are generally easier to feed, the pyrrhus and wellsi can be a bit finicky but once they start on rodents most seem to be ok.
Personally id say adders first, tigers, kings and then the browns. Tigers get narky sometimes but theyre fairly predictable in what they do where the browns seem to change their minds pretty quickly
Only my opinion, i guarantee peoples will vary.
Jordan