They are not set at one colour. Some are red and some are black.
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Quite simply, you cannot beat a roulette wheel. No matter how you play, you're always going to lose. There are things you can do to reduce your losses. For example, always use a European Wheel, and never play conflicting placements such as Red and Black together and Odd and Even together.
In roulette you can bet on color (red or black), even or odd, rows of numbers, groups of numbers, so straight up. Straight up means you bet on one number directly, the ball landing on the number you picked directly has the highest payout, with the lowest odds.
I presume you meant to say an odd number or an even number, and that the spin is the spin of a roulette wheel. There are an equal number of odd and even numbers in the range 0 to 35, but the 00 makes even more likely. Unfortunately, I don't think the casinos count 00 as either odd or even. So if you bet all your money on odd and even equally, you will lose money in the long run because both bets lose when a 00 comes up.
odd numbers
There is no such pattern because there are no even odd numbers. Odd numbers, by definition, are odd and therefore, not even.