so i need two golf cart batteries
2 golf cart batteries are technically better than a 12 volt marine/rv battery. Mainly because the lead plates are thicker and can withstand deep discharge cycles better. I recommend golf cart batteries over a marine/rv battery because of that.
If the amount of stored energy is not large, as in just LED lights to be powered, then a single 12 volt marine/rv battery could be a satisfactory choice. However, if two 12 volt batteries are used to increase the stored energy, it makes much more sense to go with golf cart batteries.
is the fuse block necessary
ALWAYS have a main fuse or breaker in the + line as close to the battery + terminal as possible. That is the safety device in case of a catastrophic failure of some sort... dead short in a wire... As for a fuse block to serve many circuits... that can be handy if there is ever a failure in some device. If only one fuse protects all the circuits in the event of a failure then everything goes off at once. That can make troubleshooting more difficult.
i don't have a solar set up, what alternatives are there to charging a battery?
Battery charger powered by 120 VAC home or campground power or a portable generator (Honda EU, etc.)
Something like a
PD 4045 combines the AC and DC circuit protection and a multi stage battery charger.
Iota engineering makes some good quality stand alone battery chargers.
LIght color is a matter or personal choice. I don't like the yellow light of a traditional incandescent for example.