What symbol can I use BEFORE the trademark is issued?

The ™ symbol, or a superscripted TM.

Esquire: How do you use the word?

Esquire is usually used as an honorific title when addressing a lawyer in formal writing.

Can I use my last name in my music career if it’s trademarked?

It depends. For example, what is sold with the trademark, and for how long? Are you 14 or 50, and how long have you played professionally?