Singing Coach?

So I'm 15
i am a very ambitious kid
def someone willing to take a risk
so i wanted to try singing
but I've always had a very...average voice.
when me and my sister were kids, everyone would always compliment her on her singing.
however me, not so much.
But i really want to give it a shot
So I'm thinking of taking my savings and getting a coach
I dont know if i actually have a good voice though
people always say, i am very monotone
and my voice is relaxing. lol

I've done a little research
so would it be well worth my money if i got a coach(a decent one)?
about how much would the lessons cost?
and any tips or info i might want to know about?
also
singing isn't just a hobby of mine btw
My step sister and i are performers.
we do lots of musicals.
so i would hope that a coach could help me learn to project better and to better my technique to help my performance on stage.

worth it?

one on one lessons with a real person

Right now you need a voice teacher. Singing coaches work with advanced singers who have been performing for a while. If you have never taken voice lessons, find a voice teacher first. They will take you to the next level.

Taking voice lessons with a professional voice teacher will certainly be well worth your money. Costwise? Well it depends on who you go to and what his/her experience is, and the area. Teachers in a metro area tend to cost a little more than ones in a rural area. Teachers who have received their Masters or Doctorates tend to charge more. Also, in demand teachers usually cost a grip, and they usually don't have spots in their studio without a "connection". You can find a teacher who might take you for 20/25 dollars for a half hour lesson at the least. Hour lessons cost a little more if they are cheap, but you don't want to just go for cheap. Do your research.

Call your local universities and music schools in the phone book of your local area. Ask each teacher how much they charge. Find out if the teacher has credentials (a bachelors of music in voice) and if they don't DO NOT waste your money. There are fake voice teachers who think because they know how to sing they can teach, and that isn't the case. You have to know how the voice connects to the body on an anatomical level in order to be productive in teaching. Usually voice teachers do have papers, but there are some who don't. These people can cause singers to develop nodules and all kinds of ailments because they just don't know how to teach properly.

Also, take a sample lesson before taking on long term lesson. See if the teacher is a good fit for you. They should make you work, but at the same time they will be supportive.

I think you should go for it. You never know what precious gift you have down in there. Once a teacher gets a hold of your instrument and brings you out of your shell, you could really grow into an awesome musician!

Do you mean a one-on-one vocal training or some sort of online practical lectures?