Any little motion you make, lifting a foot, moving an arm, turning your head immediately starts you moving. Thus, if we accept Newton's 1st Law we should expect that all objects out in space should be moving. Now let's talk about Newton's 2nd Law of Motion. First of all we need to talk about acceleration. So we see that acceleration is not the same thing as velocity.
Velocity is the change in position.
We won't talk much about it except to mention that it embodies our intuition about moving objects with a lot of mass. Trying to move a U-Haul trailer full with furniture is a lot harder than trying to move an empty trailer. A Volkswagen Beetle would be able to pull the empty trailer and make it move at 55 mph, but it will have a lot of trouble with the traier full of furniture. The only difference between the two trailers is that one of them has a lot of furniture inside it, that is, it has a lot of mass. And this is exactly what Newton's 2nd Law predicts.