It helps to decide early on what your combat style is going to be, whether it's a classic sword and shield combo, 2 handed heavy weapon, magic and a spear, or whatever floats your boat. Just remember that there are 4 main ways to deal damage that stats apply to. Faith, Dexterity, Strength, and Intelligence. It's certainly not wise to spend a bulk of your points in more than 2 of those on a character, and weapons will show you on their stat screen what stats will boost them, from an E grade up to an S I believe.
After doing some research on what you want to use, I suggest playing on the Offline mode, since Invasions are horrible and ruined by people "gaming the system" in order to have end game weapons at newbie levels. You wont get many white phantoms for assistance since the NPC ones are usually hidden off to the side, but the game, when played invasion free, isn't "punch you in the balls" unfair, it just has really good enemy placement in area's to surprise you.
And personally, I would say look through a guide when you need help with a boss or where to decide to go, or decide on what to upgrade, and where to grind for upgrading materials, unless you REALLY want to go into Dark Souls spoiler free, because if you don't know what you're doing, or where you're going, it's just a painful and long experience.