A local trusted coin dealer would be my first stop. Large coin shows are another good place. There's usually someone there well versed in ancient world coins. I'd also do some reading and online searching to learn more about the type of coins you have so you don't look totally ignorant when you talk to the "experts".
Looks like your in Quebec Canada. Try attending the twice annual coin event pretty shure it's called, Nuphilex,
It's amazing good fun lots of dealers across Canada attend. You can get different offers.