Just write heap's of lyric's and drop them in open mic. Reply to other's so they will return the favour.Listen to people's suggestion's and keep practising.
There is only 1 way to get better,Thats practise.The more you do somthing the more you learn.Listen to other's tip's and comment's.
Read other's drop's and learn from them(dont bite there shit!!)
Just write more an more and drop them for feedback.

I think that's what yur asking about....lol.....
pz