You ask too many key questions that would take a week to reply in depth.
In a nut-shell, markets can be predicted, people do it all the time. The profitable question is how.
Homework is a key factor in deterring a markets direction along with accumulated knowledge, conviction in regards to a decision, money management and, not least of all, an understanding of human behaviour.
I think it best that you open a paper account with one of the many Spread Betting companies on the Internet. Do your financial home work, make a few predictions. See if you have that cutting edge that eludes 90% of the gamblers.
And it has to be said, a roulette wheel it is not. You need plenty of balls to play this game!
Happy trading
UK