Lyft pays their drivers terrible. They are constantly lowering their prices and railing their drivers in one way or another. This job is terrible if you are looking at it as a serious source of employment. Because it is so terrible, Lyfts primary business strategy is to hire as many drivers as possible because the turnover is so high. The net result of that is that the market is completely saturated with drivers. It isn't uncommon (as far as my experience goes) to sit around for extended periods of time with absolutely no work at all. I worked in Los Angeles, and there were many days where I would work for 8 or 9 hours and make 30 dollars or less. Combined with the costs of insurance, gas, car payments, you are honestly lucky if you break even (in my case.)
I know there are people who make a living with Lyft and they do alright, but that certainly wasn't me.
Advice: If there is some kind of promotion like 500 dollars for signing up and doing 100 rides, or whatever it might be, do it. Knock out the rides and get your sign on bonus. Chances are it is the most money you will ever make driving for lyft.
pay sucks, liability high, hours suck, saturated work market, damage to your car from customers etc.