You need to make sure you pick a bike that is the right size. The measurement of your inseam is needed for this. To do this, simply run a measuring tape up the inside of your leg from the bottom of your foot to your groin. You should be able to sit on your bike while keeping both feet flat on the ground. If you can do this you need not worry about stopping in an emergency if your brakes malfunction. The handlebars you choose are another important aspect. Not all handlebars are the same. Those handlebars which extend horizontally out offer great control for maneuvering. These handlebars will also evenly distribute your weight over a larger area. For racing bikes you will want completely different handlebars, these handlebars will curve and allow you to ride your bike in a leaning position, this is to cut down on wind resistance and allow you to Bike faster. If you aren't using your bike constantly, the best thing to choose is something that is simply comfortable and allows you to store your bike easily when it isn't in use.
Which angle you tilt your seat at is also an important factor. Scooters can be tilted in a number of ways. Some cyclists are more comfortable in a slightly forward position, and therefore, find a completely flat seat inappropriate for them. Continue to adjust your seat until it feels the best for you. You can always leave the seat in the position it is in, but you will most likely find it to be very uncomfortable to ride.
The idea behind buying Scooters is to make sure that you and the Scooter fit well together—physically. This is the most important thing to consider when looking into using a bike to get around. Comfort and saftey are the two most important aspects of riding a bike.