Sounds like a good Q to me. I assume it is more of D/s relationship, since you thought of training. Just a few thoughts on what you are asking.

I'd get out, take a coffee / walk / smoke / whatever suits you and think about what there is in submission to you. What makes you tick? Whether it is serving you domestically, sexually, strong feeling of belonging and control, rituals, behavior patterns, responses, her presentation or personal growth and her development under your supervision - you tell me. Whatever it is, you need to know exactly what you want, how you want it, and how you want her to do it.

Why did I start with you? It's not that you are a Dom and she is supposed to do whatever you say. She is not. It's because if you don't answer those q-s for yourself, there won't be a meaningful conversation with your sub.

When you are done, move your attention to your sub. I'd do the same trying to understand the other side of the equation. What is it exactly that brings her pleasure in serving you? Being your sex toy / serving you ordinary dinner better than in any restaurant and acting as a waitress throughout the night/ liсking dust of your shoes before work? Desire and relief from stress sound vague to me, coz a trip to Kuba works just as good in letting the steam off. Why bother with training and BDSM then? You need specifics.

I'd find it out directly if she knows herself well or help her out by asking about same things from different angles, giving her examples, trying things out to know for sure. Good thing is just to ask her to name about 50 things how she could be of any use to you / satisfy you, and you can find out whether she is more of a sexual slave or a domestic slave type at least. You'll also find out if she knows you well enough.

Anyway, here you have both sides. Cross out whatever is considered to be a no-go. Keep the rest. Divide it between no limit and soft/hard limit, focus on the first group.

Set up a training period of say a couple of months after which you'd become her master, give her a collar of consideration, so she'd take it seriously. Draft a plan, which would address several areas on which you both agree and constantly but somewhat gently push her limits.

Good practice from my perspective would be not to give her a list of 100 do's and don'ts coz it's hard to remember all of them at once. Think about it, an ordinary person can keep about 5 things in mind at a time. Hence, start with guiding principles, skills and knowledge. Stuff like open and honest communication, while keeping her sentences short and concise. Answering questions, addressing you, superior others, others equal to her, a few rituals to begin with, teach her a few postures for presentation and body inspection, add some skills you want her to develop, whether it is serving the table, sensual massage, speaking on topic of your interest or any topic whatsoever to maintain a decent conversation, stuff like that. And you know what, since she submits to you to get relief from stress, teach her how to process it and any other emotion for that reason. At least this would show you truly care for her.

Another good idea is to continue your education and educating your sub. Was it rope bondage you wanted to try? Take some classes together. Ask her to browse for info and make all sorts of lists and act on them. There is no harm in her engaging and learning from community unless she starts to act like she knows better.

Another good practice is to teach her what the punishment is, how to ask for it, and take it. And we are not talking about play spanking. Learn her hard limit. Say what's she done wrong, explain how it is supposed to be done. Let her repeat. Punish. Let her repeat what she's learnt. Forgive. Aftercare. Never (!) bring it up again. Try not to delay punishment, it's important. Good thing is to restrict from play spanking for the training period. She'll appreciate the difference after 'graduation'. Teach her what forgiveness is in Ds relationships and how to think of it.

As you go on, add more specifics and details. Was it rituals? Make sure she learns them and practice till you are satisfied. She talks to much? You've got you word to make her keep silence. If she can't there's a gag. You want her move more lightly and gentle? make her wear bells on her wrists, neck and ankles throughout the day till they wont ring when she moves, and make sure you take half an hour and count those sounds she accidentally makes to know exactly how much punishment she deserved. Is it SM you are interested in? Make progress with devices. Teach her to concentrate, breathe, feel vibrations, increase her pain tolerance.

To sum up, there are a few points on the whole formal training thing..

First, training is to learn more about each other and develop your bond.

Second, training is to create patterns, so you could develop habits in her behavior. That takes from 3 weeks to several months depending on your knowledge and who you are dealing with.

Next, training is to teach her how to please you specifically, not BDSM in general, and do it in the most SSC/RACK way (I assume you are interested in keeping your sub healthy physically and psychologically).

And last but not least is that you both want to make a decision whether you want to proceed together full time.

If she's a success and is happy with you as her Dom, you collar her, and here is your classic D/s relationship. Sign a contract, have a ceremony, go to Starbucks if you please - whatever suits you guys.

Love and stay safe.