What size ring connector is needed to attach wire to terminals?

They are #8 as described in the description. Hard to find #8 rings in heat shrink connectors. #10 worked just fine for the terms and it seems all manufacturers sell this size.

Can I run +/- from batt to 100 amp breaker then +/- to fuse box so I can kill power to fuse box?

Yes you can. The fuse box will be powered off breaker. I used a toggle switch panel instead of a main breaker.

Product page says this can handle 100 amps per block, does that mean 100 amps on the left 6, and another 100 on the right?

No, it means 100a peak draw for the entire block...30a peak per circuit. The main positive in should be fused at 125 per the specs from BlueSea.

Does this block come with a positive and a negative bus? I don't want to have to daisy chain the positive lead to each lead on the panel...

Yes, it does indeed come with both a positive (fused) bus and a negative bus. Very nice unit, as with all Blue Sea products. I would and have bought again after purchasing mine.

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Description

⚡ Fuse your circuits with confidence and style!

USER FRIENDLY ACCESS - Easy-open push button latch with storage for two spare fuses keeps maintenance hassle-free
POWERHOUSE PROTECTION - Handles up to 100 Amps for robust circuit safety
MARINE GRADE DURABILITY - Tin-plated copper buses and fuse clips ensure long-lasting corrosion resistance
CERTIFIED SAFETY ASSURANCE - Cover meets ABYC/USCG insulation standards for trusted marine and industrial use
STREAMLINED CIRCUIT CONTROL - Consolidates 12 branch circuits with in-line fuses for sleek organization

The Blue Sea Systems 5026 ST Blade Fuse Block is a 12-circuit, 100 Amp fuse block featuring a positive distribution bus with #10-32 stud, tin-plated copper buses for corrosion resistance, and a cover that meets ABYC/USCG insulation standards. Designed for streamlined circuit management, it includes an easy-access push button latch, spare fuse storage, and label recesses, making it ideal for professional marine and industrial electrical setups.