Been reading this board for a while, but I figured I would share what I look at before signing up anywhere. After trying maybe a dozen sites I stopped trusting the big banners.
Licence comes first for me: check who regulates the site, because some sites quietly block certain regions. After that I look at banking: I want at least one fast e-wallet option, and cashout times should be listed up front.
Bonuses are the tricky part. Wagering of 35x or 40x is normal, and live tables often do not count at all. A useful overview with bonus rules, app info and payment methods is worth a read here [url=https://sites.google.com/view/slotshopper-casi-1912/]gioca su Slotshopper[/url] so you know what you are signing up for.
Most of my sessions are on mobile, and if there is an app I make sure it comes from the official page. Test the live chat before depositing: slow or scripted answers usually mean trouble later.
That is about it. Set a budget and stick to it.