Fuse block. And if you convert your lights, etc to 12 volt bulbs you can make that upgrade too. 12 v alternator, starter. The wiring really doesn't care. Wire in some relays for your headlights, horn, etc.
Here's a link to a string on TheSamba.com about rewiring a buggy
http://www.thesamba.com/vw/forum/viewtopic.php?t=564769&start=0It's not hard, but there a some good kits out there too, such as from Rebel Wiring or Highway 15. I used a fuse block from Painless Wiring. It's nice, but over kill. On the Samba string pay close attention to what Murzi has to say. His was VERY clean and simple. He lurks on this board from time to time.