Well, if you want to be more of a melee style, the Purple Flame Shield +10 is the way to go.
Overall it's the best shield in the game, if you count it's low weight, high physicial and fire reduction and super high Guard Reduction (82% at +10, only offset by the Tower Shield +5 at 85%).
To find Dragonstones you'll need to farm them off 2-2, the Bugbears have a high chance drop for them. You'll have trouble finding chunks, but all the chunks you need to go Dragon +5 are found in the lava on the lowest part of the stage. Just bring lots of fire resistance items and armour, plus the spell Water Veil to get them.
Are you going to make a Tearing Uchigatana? That's a really good weapon, but you'll need high Dexterity to have a good attack power with it, plus Sharp Uchigatana is way better.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
