Fortunately these are constantly moving. When stars twinkle rapidly, this is a result of the warm and cool air mixing. This results in poor viewing. Try to observe on nights when the stars have a steady 'burn' like the planets. A heavy haze causes poor viewing but a faint haze usually means a still atmosphere and good viewing may be possible.
Stars always appear as pinpoints of light.
They are at such great distances that any discernible size difference between very low and high magnifications within the telescope is impossible. The light gathering power of the telescope allows you to see stars and planets that your eyes would not normally see within the solar system. This means it is frustratingly difficult to find anything in the sky with the telescope alone. A small telescope called a finderscope is mounted parallel on the side of the main scope to get around this problem. The low powered finderscope with its four to six degree field of view and central crosshairs permits precise aiming before you look through the main body of the telescope.