Well, as someone who's kept a goatee, mustache, and currently a beard, the best piece of advice is to work with what you have. Let things grow out for 3 weeks to get your base. Then you shape it to your face. Aim to keep it between trim and moderately full. Avoid anything crazy, unless that's just you, in which case expect none of the aforementioned women. For care, shampoo and condition it at least once a week. You'll need both a beard trimmer and a good pair of scissors.
And neckbeards, btw, are too unkempt and reminiscent of 'neckbeards'. Keeping your neck clean every few days is much easier than a daily full shave, so just do it.
As for women, it really depends on the individual. Some dig facial hair, others not so much, and still others appreciate (or just put up with) variety.