Get the best most reliable autopilot
you can afford. Buy twice as many solar panels
as you think you'll need (min 500watts) to keep everything charged. Get a 18' sea anchor
properly set up and know how to use it.
For your first multi day offshore
passages ensure you have a minimum of one competent/experienced sailor aboard and a minimum of three persons so watch standing is more reasonable.
Wait for the right weather. Never be in a hurry nor put yourself in a position to feel pressure to go offshore
without near perfect weather... it does exist and is worth waiting for.