Welcome. 1. Always with stache in my opinion as stacheless beards look incomplete or immature on most guys. The stache is the part of the beard that produces the most visible changes in appearance. 2. In combination with other facial hair, I would not sport a longer goatee than the rest as this may look somehow uneven. Yet, this is my personal opinion and it will not look bad on you either way (and younger guys have surely more freedom in this). If you want a longer goatee, go for only a goat and stache combo,