Start betting the black...or any opposite on the outside bets.
This slows your game down. If you lose...stay on the same bet..and double it.,
So say you bet 5 and lose...Now bet 10.....If you lose bet 20. You now have a 35 investment on the table...but when it hits that third spin..you take 40 off the table...so +5..... or in other words you would alwasy be +plus the starting bet.
Double you bet? Are you serious? This may sound good on paper, put in realilty this type of progressive betting (aka the Martingale) is one of the worst betting strategies. So basically in the above example a person is betting $40 to win $5 or 8:1 for approx 1:1 chance of winning. I know bookies who give a better vig than this. If you want to double your bet, I wouldn't recommend going past $20 on an initial $5 bet.
The best strategy I can give, keep the $400 and don't play again. I myself have stopped playing for a month until I can improve on my on strategy. But like fmahovalich says,
looking for trends is not bad advice. Some may tell you that each spin is independant of the last spin, but I do believe there are patterns, albeit short at times, do emerge. But I find that these are hard to capitalize on.
One maxim (I read in one book) I hold to is "Go for small gains, until your winnings enable you to go for larger gains". Which means you have to accept
a lot of small wins before you increase your bet.
The way I see it is that there are 3 types of Roulette players. 1) recreational player (most people are these), the person who bets on random #s, including birthdates, fav #s etc. 2) trend betters these players tend to bet outside and look for patterns in columns/dozens, hi/low, etc. 3) section better (similar to trend players), these players look for which section of the wheel the ball tends to go to.
I consider myself more of a section better. I look for patterns to which area the ball goes to. This strategy worked for about 12 sessions, but afterwards I just went downhill. Though I am still up, I took it as a sign I needed to change my strategy.
Single 0 tables, as some others suggest, can be found at the high limit area of Casino (at Fallsview/Rama), but they carry a $25 to $50 min!
for a book regarding trends check out: Gamble to Win by R.D.Ellison ISBN 0-8184-0627-5
for a book regarding section betting: The Roulette Formula by Kimo Li ISBN 141207594-7