new tank now what


Well i have a 20 gallon and i now have a 28 gallon bowfront
I need to know how to start this new tank.
I filled the tank and then put in 2 gallons of my 20 gallon tank water in it to start it should i do water changes from tank to tank every couple of days.
how long will it be before i can transfer my existing tank into the new one :notsure: