This game can be beaten fully naked at lvl 1. Your starting character has very little effect on the rest of your playthrough.
The game doesn't have classes in the same way other RPGs do, so you're free to use any and all items you have the minimum stat requirements for. Any time you level up, you can increase any stat as many times as your runes will let you.
If I have one piece of advice, it's to increase your Vigor to about 60 by the time you beat the game. You can put enough points into other stats to have medium weight and use the weapons and spells you want, and for the most part, the rest can go into Vigor. This is especially good in the beginning when you're still learning the game.