I use cwm: https://rgz.ee/openbsd/cwm.html You can install popular desktop environment from packages: http://cdn.openbsd.org/pub/OpenBSD/6.4/packages/amd64/

For example:

# pkg_add gnome

Ethernet drivers: https://man.openbsd.org/?query=ethernet&apropos=1&sec=4

Wireless drivers: https://man.openbsd.org/?query=wireless&apropos=1

Video drivers: https://man.openbsd.org/?query=video+driver&apropos=1&sec=4&...