Before you make any program you need to have an idea of what you want it to do. Once started you may while making it think of other things that would be good too, but that's normal, so, which ever language you choose to pick, try and pick something that is simple, the "Hello World" program is famous in many ways as generally its a 1 line program (or as few as possible), this is always a good place to start. Displaying something to the user. Normally the most fundamental program is referred to as "Hello World" this is because its one and only purpose is to display "Hello World" on the screen.
For a much longer project, if possible, on a piece of paper write down all the things you want it to do, and tick them off when you have done them. If you think of extras add them to the bottom, this list will come in useful. When you come to make a user guide or something or someone asks questions. It also forms a rudimentary specification idea, so you can always show it to the intended and say what else do you want, if they say nothing, get them to sign it, and anything that is missing becomes their fault.