Notes from author
(Note: This is not recommended for beginners. It is extraordinarily hard to acquire all of these items without leveling up. Try doing this with a friend or two, all gunning for a level 1 build.)
Designed for low level PvP, takes advantage of pyromancy's lack of requirement.
Maybe your most formidable weapon is the magic light crossbow with lightning bolts. This deals crazy high damage, magic defense is the rarest, lightning is second rarest, so you're guaranteed to penetrate them. If you can, use the binoculars to get head-shots.
Remember your dragon flames, as these are very useful for catching the enemy off guard.
Make sure to gather up as much soft humanity as possible: In addition to it increasing your damage with your chaos weapon and your item discovery, humanity is counted toward defense the same way as other stats; you will have far more defense with 99 humanity than 0.
Something that is important to note is that there is no upper level limit for either the red eye orb or the red sign soapstone, so be prepared to be outgunned.
Many people will be new to PvP and the unspoken rules, so keep that in mind. You may even try to educate them on the matter, but if not, try to be as honorable as possible. Don't be afraid to drop items for them, just as a courtesy, and remember when you were in their place.
(Important note: dark souls has been out for a long time, there are now fewer low skill and low level people, and you may encounter others doing low level PvP, or even hackers.)