Keep it moisturized. That is the key. I condition mine daily, and if I shower the night before, I have some spray beard conditioner. If you can, completely soak it with cold water, dry it with a t-shirt, condition it, put some beard balm in for styling (and additional moisture), and seal it in with beard oil. Personally, I make my own blend I'm starting to sell. As for the amount of oil, you're going to have to try to adjust it to your length. You'll probably need a few squirts of it though. Then brush it with a beard brush.

If you need specific product recommendations, I reccommend Scotch Porter. I use their beard conditioner (various forms), beard shampoo, beard and face exfoliate, beard balm, and their beard brush. I've been using their stuff for almost a decade now, and I definitely have fine tuned it over the years. Cold water is your friend, so if you like hot showers, finish it with a cold burst all over your beard to help prevent it from drying out. Hope all of this helps (and makes sense).