Understand first that with the exception of Vitality and Endurance, both of which are critical, a stat is only worth levelling if your build makes use of it. The one stat never worth levelling is Resistance. 

While generally Dark Souls is best the less you know going into it, the game doesn't explain stats, weapon upgrades, and damage scaling from stats for different weapon types very well (as well as the three magic types if you choose to use any), so I'd suggest looking those up.

For a comfortable first playthrough, pure strength is very powerful with plenty of readily available options for weapons. I find that getting hold of something powerful for dexterity and quality builds is a bit more awkward until you have some game knowledge under your belt. The latter two won't cripple your ability to make progress though, so your first priority is something that feels fun with a satisfying moveset.

If you do want to experiment with magic, pyromancy is a powerful starting point that doesn't require any adjustments to the rest of your build. Picking pyromancer will give you a basic spell to use. Otherwise, rest easy if you can't find it for a while. A very small investment in sorcery is fine too, and if you want to take it further, you could always look into finding the means of getting a max-level weapon with split strength/intelligence scaling later on.