So you want to become involved in the music business? Which side of the music business? Performing end or supporting end? It does make a whole world of difference as to which end of the music industry interests you. For purposes of this discourse, I will assume that you, much like 98% of those interested in music as a career, are interested in performing.
Talent is tantamount for performers in the music industry. You will need a bit more than just average talent to get started. Hard work and dedication will carry the day, but talent cannot be left at the door. A good singing voice, a "better than most" ability on a musical instrument, and persistence toward your goals are the minimum entry requirements. It would help a lot if you have an understanding of musical theory as well. It's not necessary that you be a trained musician, but you must make the effort to learn your craft either on your own or through lessons to be taken.
Join, or start a group. It is a tougher road to navigate as a solo performer than as a member of a group. Of course, it should be a group of singers and musicians who are attracted to the same genre of music. This makes it an interesting, as well as challenging experience in a new career within a group context. Music is, and always has been a collaborative effort. The rewards of a group effort are compounded.
Start compiling a repertoire of songs and music that your group enjoys performing. Have at least 40 to 45 songs that the group is comfortable with performing. The particular arrangements of those songs will be a result of the chemistry and cooperation between the band members. It will take a while to develop this list, but the process during this time will be devoted to practice, practice and more practice. This is the dedication aspect that was mentioned earlier. Dedication and persistence are necessary to get into the music business.
The band's performance skills are honed at local venues. Look at the local club guides for venues that cater to your particular type of music, and contact the club managers for possible playing times (no pay) for your group. There are many clubs and restaurants that welcome live band music for their patrons.
Once a fan base has been established, the next step would be to record songs. Welcome to the music business!