Recruit only heroes who have a score of 60+ in at least one stat: Politics (POL), Intelligence (INT) , or Attack (ATT). Ideally in the beginning you want to find a hero with high POL to help you build structures faster and gather resources faster.
Theoretically you could recruit your first hero with less than 60 in a stat but you’ll want to “release” him as soon as you find a hero with a 60+ Politics.
You might for example find a hero with a 45-50 in Politics. It’d be better to have a hero with decent politics even if the score isn’t that high. At least you’ll receive a small benefit in building and gathering resources. After a little while you may find a hero with a 60+ in Politics. At that time you can release your hero with the lower politics score.