do i put most of them in str?

it depends on your choice of weapon.
each weapon-type has a str/dex ratio.
swords, for example, are mostly strength-based. on my fighter i stat all the vitality i want and then pump strength for the rest of my climb.

look at the different weapons on the ladder slasher portal and you'll learn what to stat.

http://ladderslasher.d2jsp.org/index.php?g=3
check the ratios.
just look which weapon you use --> check ratio --> put all into the higher number (for example club 90/10 str/dex --> all into str)
you can also put some stats into vita if you want to tank.. else just str/dex