Newbies Guide to a summoner (Part 1 : STATS.)

STR: WASTE of precious points. DO not put any points in here.
EGO: Around 200-250 ego will suffice. (WITH GEAR)
INT: Add until you have around 1.6k-1.8k sp without any gear.
VIT: DUMP all points into here.
DEX: Add any into dex and i'ii castrate you. DEX is useless for summoners.

1.8k-2k sp is all you will ever need for summoning and using mass spirit bond, with gear your sp will likely get even higher so there is no need to dump too much points into int. As for ego, 200-250 is enough for your overdrive coupled with 1.8k-2k sp , to last over 10 minutes which is  enough imo. VIT is the most important as summoners only have elementals for protection so the higher the hp the better.

So basically when leveling, dump points into int and vit (try to balance it out but once sp reaches 1.6k-1.8k without any gear stop adding points into int. Instead add all into VIT until level 90 where you dump points into EGO until you have 200-250 with gear. After all that, VIT is the way to go.