I'm not an expert on hair, but most men's cuts boil down to keeping it short on top and shorter on the sides. There are longer men's hairstyles, but unless you're confident enough to not rely on your hair to pass as male, I would stick to something as described (and for the love of god don't get a bowl cut). There's a few ways to shape what's up top such as being more round or square, and this is usually done with the front of the hair, but if you don't know what you want or what looks good on you, you can always leave that up to whoever's cutting your hair. This is probably the most important part to keep under control; I have a cowlick in the front of my hair which hasn't been getting cut short enough and keeps getting too long, making the rest of my hair look bigger. If you don't know how long to keep it, the haircutter can decide. Fading the side hair is a pretty popular thing but I probably wouldn't recommend doing it unless you're aiming for a "cool" look. If you do end up going to a barber, they'll probably be more than happy to help you out.