Well. You know, when I started writing songs, I would just take chords put em together so they sounded right, but it prolly wasn't the right choice. It was ok, but songs don't sound just quite right unless you're using a scale. So I suggest that you get a nice scale, I suggest C cuz its the all natural scale(no flats or sharps) and you just get a nice I IV V(1, 4, 5) progression going. Hopefully you know the importance of that. You know, just make a simple progression, and you know just get creative. Remember, don't always follow the rules. For example, in a major scale, it goes I, ii, iii, IV, V, vi, vii half diminished(don't know the symbol for diminished), and then I again. Which means one, four and five, are major, two, three and six are minor, and seven is half diminished. But I don't follow those rules all the time. Especially with seven, it just sounds horrible. I don't always get my 2,3, and 6 all minor. Scales, well, if you want to learn improvisation and soloing(kind of the same thing) you NEED to learn the pentatonic scales. It's easy to learn and to remember, and it fits well over most things. But scales like major and minor are as well key to anything with guitar. But really, I suggest, just you know going into keys, and getting simple progressions. And even though the I IV V is a lil ez and too, eh, idk, just, it just doesn't sound right, like you hear it in lots of stuff. That's cuz its good. But sometimes you may not even hear it in the song when its rly their. One of my favorite beatles songs, Revolution is basically just I IV V.