Hi and welcome back. Glad to hear things are going well and you're thinking of expanding your fur family. I don't think there's any set advice for when to introduce a new cat - so much depends on the character of the existing cat and the new one. Are you thinking of getting a kitten or an adult? Whatever you go for, just follow the usual advice of gradual introductions, taking it at a pace that suits them all. Sometimes you can just throw the new cat into the mix (not literally of course
) and let them get on with it, other times you have to keep the new one separate for a while and do short, supervised introductions.
Good look choosing.