It is very hard picking out a song for someone over the internet.  I don’t know your type or personality or singing range. Also I tend to prepare a new audition song for each audition.  Generally they do not want you to sing a song from the show you are auditioning for, however, what I’ll do is try to find a song similar to one from the show especially sung by the character I want to play.

I suggest you look for the type of characters you’d like to play and work on songs they sing.

You should find a pianist to help you, even if it is just one hour. Discuss what you’re doing and what you need. The places I audition for want only 18 bars! So I have to be judicious and creative in cuttings. Have the pianist mark up your sheet music and then play it once so you can record it to work with it on your own.  You’ll need that sheet music with markings to give the audition pianist and be able to explain it to him/her.

BTW I like Music Notes to get sheet music  http://www.musicnotes.com/  I can buy it online and I have the key transposed to fit my range!  For me that is a good thing, but sometimes you’ll not do your pianist a favor.