1) do it as soon possible both for yourself and the other. Any way you do it it'll be shit, so don't overthink how to do it
2) unless you have children together or need to sort out "administrative things" (rent, things in common etc) have zero contact with the other person forever (both for you and the other person, to really feel the pain, digest the break up and become free to move on with your life, both of you). Not doing this will only drag this inevitable process.
I'll stress this point more because I'll die on this hill: ppl who wants to stay friends or in contact with ex because "they don't want to lose someone who's been such an important person in their life", prolong the recovery phase for both and kid themselves to be able to have a friendship relationship with their ex. There will always be a "soul bond" with your ex and it will never be not like that, because you bonded in such a deep way that it can't be avoided or forgotten at a deep tissue level. Does it suck to lose such a person? Sure it does, but living in the past prevent you from living in the present and future. And it sure sucks losing an important person forever, but such is life, it goes only forward, and you must think about the future ppl who will enter your life.
3) like the great
@Telluride said, this is going to be one of the best time to work on yourself and makes changes/try new things, embrace it fully
4) sorry to hear that man, sending you love β₯οΈ