+1
That's a big +1 for practicing with metronome
I'm not sure what type of tips you're looking for in this thread, but you did ask for tips for beginners, so I'm posting some things that are very basic.
As far as scales go. I think it's important to think of the intervals - That is, step one is learning that the intervals in a major scale go: whole, whole, half, whole, whole, whole, half. Then, you must know that a minor has a lowered 3rd, 6th, and 7th. From there you can begin practicing your Major and minor scales. At first, I think that it's okay to play major and minor scales from root to octave - just to get the sound of a Major and a minor scale into your head. Make sure to play them in all keys. As soon as you get down the very basics of scales, you'll want to switch to playing all of your scales in position from your lowest note available in that position through the highest note in that position. (See Pacmans scale primer for a complete explanation of this) Practice arpeggios in a similar fashion and always practice both with a metronome.