Depending on what you want to brew exactly changes the yeast to be used. Do you want a traditional mead (Honey/water/nutrient/yeast)? Or do you want a Melomel (Fruit mead), Metheglin (Spiced or herbal mead), Cyser (Apple mead), Pyment (Grape mead)...............?
Fermenting time depend on the recipe. I have some done in weeks, others done in months.
Aging is always recommended. Depending on the recipe you may be able to drink it within 3 months but aging 8 - 12 months before drinking is common.
Let us know what your preferences are and we all can direct you to a recipe & directions that will help you out to get a decent product.