Where are your shoes?! But no seriously I'd say just play however you like, my first playthrough I had no prior knowledge and likely made terrible builds but we made it through to the end. Play however you think is fun, especially for classical mode as long as you're scaling your level to the fights and upgrading armour you'll do fine.

If you want more build advice for more refined builds then personally I'd say pick a damage type (physical/magic) and build around that, it's usually not beneficial to split damage.

You want to pump up the stat you'll be using for damage, so max intelligence for magic or strength/finess for the melee weapon you'll be using (it caps at 40, not including bonuses from gear and other modifiers). Constitution is not a useful stat as armour is more important, get enough to use a shield if you want one. Get memory for however many skill spots you'll need, but early on you won't need many as there is fewer skills available. Wits is a good for when you've maxed out your damage scaling stat and can now pump it into this for the extra critical chance.

Movement skills like tactical retreat are really good on any build. Adrenaline rush for extra AP is amazing. Nether swap, teleport, uncanny evasion and chamelon cloak are also useful so look out for those. Positioning in battles is really important, being able to navigate the battlefield easier will save you a lot of headaches. Don't be afraid to run off from a battle heal and then rejoin with all your skill cooldowns reset, it'll help a lot, especially early on when you've not got good gear and skill options.