Musicians

I have been playing guitar, dobro, mandolin for many years.
It sounds like you are on the right track. If I were to give just one peice of advice, it would be this. Much like a golf swing,
if you start out with the wrong mechanics, it will really hurt you in the future. For example, left hand technique (if you are right handed). Have you ever noticed that really good guitar players (especially bluegrass flat pickers) look like they are hardly moving their fingers? This is because they pay special attention to the excercise I am going to describe.
I wish someone had shown me this years ago.

Start on the low E string on the 5th fret.
put all four fingers of the left hand on frets 5,6,7,8 touching the strings. Now, pluck the note on the fifth fret - here's the key, lift your finger off of the note you just plucked and keep that finger VERY close to the string while plucking the note on the 6th fret and so on, work your way up through the A,D,G,B high E strings. It sounds complicated but what it boils down to is NOT lifting your left hand fingers too high off of the strings when you pluck a note. This is the best way to develop fretting speed.