punter_frorLong time lurker here, thought I would drop what I look at before signing up anywhere. After getting burned once or twice I stopped going by ads alone.
I always start with licensing: check who regulates the site, because some sites quietly block certain regions. After that I look at banking: card, e-wallets and bank transfer should all be there, and the withdrawal limits need to be written clearly.
Bonuses are the tricky part. Read the wagering and the max bet rule, and live tables often do not count at all. A good recent review that covers all of this is here [url=https://admin.phacility.com/F644109]play at Rolletto[/url] before you deposit anything.
I play almost only on my phone, and if there is an app I make sure it comes from the official page. Support matters too: slow or scripted answers usually mean trouble later.
Anyway, that is my routine. Treat it as entertainment, not income.