Starrlee, as typed above you gotta hear the song first. Have you every listened to a song and found yourself tapping your toe to the beat of the song? Strumming is about timing, getting a feel for the beats of a song. Listening to the bass notes or drums will help you get a feel for this. Songs ar written in various thming formets - 3/4 (waltz timing) and 4/4 timing being the most common. As an example in 3/4 timing you have 3 beats per bar and it is counted 1, 2, 3, 1, 2, 3, 1, 2, 3. In 4/4 timing you will have 4 beats per bar and it is counted 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4. These would be 1 strum per number. So you gotta learn to count the beats in a bar. Eighth nots, sixteenth notes will change everything but someone else will need to explain that.
Pick a song - hopefully a good ole country song - thats good and slow to begin with and that most folks will likely know and I will try to help you figure it out. Gimme an idea of a song that you like.
Next time you catch yourself tapping your foot to a song just put a pick between your toes and you be strummin'.