Easy way :
1. Buy casino's script from 3rd party
2. Loan lots of money for casino bankroll
3. Ask trusted people to set everything for you
Hard way :
1. Learn programming (HTML, CSS, SASS, SQL, Ruby on Rails, etc.)
2. Hire people for customer service, promotion, etc.
3. Fundraising money for casino bankroll or use your team's money
4. Some idea for your casino games/design.
How are you going to buy a script when you need to take a loan ?
People you trust ? You should be doing that anyway. Also no one works for free forever so you will have to hire. How is having an idea the "hard way"
I think its more about being lazy and actually doing some work.
The safest way is to still invest in some rep gambling casino. Instead of gaining like 0.6% for the house profit, you can use the btc to invest in different btc casino and earn 0.4% or so investor profit. Of course, it cannot be calculated in such simple calculation but owning a btc casino has a lot of issues you need to overcome. If you cant manage to do it yourself, are you able to form a reliable team?