I grew up with a very strict family and I was taught kinky sexuality was bad and sinful. I wish someone told me it was ok to have the kinky submissive desires that i have. I have spent too many years suppressing these feelings. Now i just want to let loose and explore.
First of all that being a submissive does not mean you have to crawl at every Dom's feet. That respect and honesty has to be mutual in D/s relationship. That you should meet other people who are into this lifestyle and make some friends, just because it is good to have someone to talk to when needed, and sometimes those people might be a support for you.
You will get lots of advice about what being a sub "means". Remember that everyone is different and if both you and your Dom are happy that is all that matters. Don't let someone elses idea of what a sub should or should not be make you feel like you are not good enough and start doing things that make you uncomfortable and will likely damage you in the long run.
Just be yourself and take your time.
Maybe something along the lines of...It will be one of the hardest yet rewarding journeys of self discovery you've found yourself on so far. There will be a lot of tears, some heartbreak, a lot of orgasms and the deepest most honest connections with people you'll ever have experienced. Cherish the whole ride, good and bad, because it leads to who you truly are. Either that or... you'll be fine, just remember... you chose this. Lol