My advice is to to conduct a search on "blacklisted or rogued" casinos. Many of the same names will appear like GoldVIPclub, CoolCat, Mighty Slots, etc. Also check out Gamblinggrumbles.com to see recent complaints on posted casinos. Do not play at these kind of sites because you'll go thru alot of stress and worry if you win. Also, don't fool for huge bonuses...they lure you in for a reason.
Read the casinos terms and conditions. If they don't work on Fridays, but take your deposit, there's something wrong. Learn by other's mistakes and what they have reported as you don't want to fall into the same trap they did. Also, make sure you read about people winning and getting paid with no problem. Many casinos appear to be reputable because they pay, but there are very few winners. Find a place where people are winning and the casino is paying them.