Hi there,
Be careful what you ask for. I had a mentor in my early stages years ago and I was lucky enough to have somebody who genuinely wanted to help and educate me with no pressure and no ulterior motives. As much as having a mentor could potentially help, I really encourage you to go knowledge-seeking yourself. Yes, there's a lot of misinformation out there so be careful, but I'm sure with some of the resources here and any other secure sites that using your common sense, aren't fake, you should find success in doing some research on your own.
I hate to mention fifty shades of grey, but one of the things that really bothered me in that movie (haven't actually read the book) is that when Ana is considering the contract, Christian asks her has she come to a decision or done any research. and Ana asks what she should search and he simply replies "try submissive." She ended up coming across some shibari photos and got scared closing her laptop at the thought. Such a silly thing to do and such a broad search as that can have you looking at or finding anything that could be either too much too soon or again, very misleading. So..
It's best I feel to ask yourself some questions first before looking too deeply into the lifestyle for information. Questions such as why does this lifestyle interest you? What do you hope to gain from it? By answering these, you are giving yourself a starting point as to what you want to research and in what area. It's important to note that whilst BDSM of course generally speaking pertains to that of sexual intimacy and kink, D/s to me doesn't have to be sexual at all. It can be misleading for a newbie to be under the impression that all BDSM relationships involve D/s and that all D/s relationships involve BDSM. So again, figure out what you want in terms of being a part of this lifestyle and then that should give you a basis for some research.
Good luck!
Sweet.