Just saying, if you use a name like that you will get put with the 10-8 year olds. Go for your real names and maybe add 1 word to your first name or something, and dont go for anything like starz, you will regret it later was it will be very cringeworthy.
Anyways, for doing stuff like this you dont use an agent until you get pretty noticed. First, start out singing on youtube and soundcloud. Then, see if you can try to get a spot on some kind of talent show like america's got talent.
Next, youll be older. You dont search for an agent, an agent searches for YOU.