If I understand what you want to do:"add some fuses for safety": Add some $4 inline fuses, fused to the amp draw of the components you wish to "add" safety to.. If your wiring is good.
VERY IMPORTANT: Read the various opinions/instructions on this forum for switching to 12V. Some components will do fine without replacement, some will not.
See O'Reilly's: replacement parts/lighting and electrical/fuse and fuse accessories. All kinds of ideas there.
If you are "restoring", do it with all new wiring and fuse box, etc. If you are wanting to get it going and drive without much bother/money, change bulbs and such items that will not run on 12V.