I can't seem to locate a guide to wizard/ranger build.
Some help would be apreciated
Don't do wizard/ranger do wizard and ranger. Ranger with special arrows is like a wizard and you don't have to spread your stat points to become good for nothing hybrid.
I've managed to make a beast of a ranger on my second playthrough by putting 2 points into Scoundrel and getting useful Hide in Shadows (no need for sneaking with that), Cloak and Daggers (your 2nd teleport since Tactical Retreat) and Charming Touch (2nd Charm). Get ranger a Glass Cannon talent and put stats points into perception, speed, dexterity and maybe occasionaly constitution if you wanna (you can buy stats and abilities raising books after every level up from Keeper of Secrets at Homestead) and you're good to go.
This ranger has many actions points, good at ferreting out secrets and traps, can loot everything and can get out of every dodgy situation.
Leave wizards schools for wizards, because to make the best of out spells requires intelligence anyway. I don't like Lone Wolf talent, so I played with my second main as fire\earth wizard to complement Jahan with eventual 2 points in water for healing spells. Jahan had his usual water\air with 2 points in witchcraft for those uber spells like Oath of Desecration, Ressurection, Absorb Elements and Invulnerability.
Everyone had Glass Cannons except Madora who was our tanky buff sponge.