Drake sword to start, obviously. Claymore (fire, magic, enchanted, whatever) until MGS. --- "Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment." ~ Richard Bach
1. Start with Master Key. 2. Find a weapon you like. 3. Upgrade it to magic +5 via the blacksmith in New Londo Ruins. 4. Get the enchanted ember in Darkroot Garden and give it to the blacksmith in New Londo Ruins. 5. Upgrade your magic +5 weapon to enchanted +4.
Green Titanite Shards can be farmed in lower Blighttown. Blue Titanite Chunks can be farmed from Crystal Golems in Darkroot Basin.