Well if you are that new I suggest just *ing to the ninjas you get from Plot/Elite Instances (possibly get the ones that have skilltrials avaible to 4 stars and start getting their skillbreaks) and save your seal scrolls for later treasures like Kage or GNW Treasure and saving your coupons untill you can get an actual good ninjas from the events (which will take a long time but it's worth it in the long run).