Long 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.
Licence comes first for me: find the licence number and look it up, and whether they actually accept players from your country. Next come deposits and withdrawals: 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 some games count less towards it. A useful overview with bonus rules, app info and payment methods is here [url=http://weblabor.hu/tagok/122113]lilibet casino bonus code[/url] before you deposit anything.
On mobile I mostly use the browser version, so I check how the lobby works on a small screen. Ask support one simple question first: a real human reply beats a bot loop.
Anyway, that is my routine. Treat it as entertainment, not income.