Cleaning after cycling

I was just wanting to know when you should do a water change for the first time? I'm 2 and a half weeks into cycling and i know not to clean during cycling, but once my tank is established and i put my axies in, how long should i wait to do a water change?
I'm confused about that coz when I get my axies, the water in the tank would have been sitting in there for at least 4 weeks and from what i'm told, i should be doing 25% water change every fortnight after the tank is cycled. So should i do a 25% water change as soon as the tank is cycled or should i wait till my axies have been in there 2 weeks and then do a water change?
Am I even making sense? lol
All advice welcome! If it helps, my tank is 30"x12" and 15" high and is being cycled using comets.
Ta guys!

im not too sure on that one to be honest but waiting two weeks sounds like a good idea after the axies have been added just because your tank needs to get up to scratch with the bio load from your new babies!!!

After your cycle is finished, you should do a 20-50% water change to lower levels of nitrate BEFORE you put the axolotls in, and then do a 10-20% water change weekly, as needed.

Yes as Joan said right after the cycling is finished, do a big water change to lower the nitrates.