I'd got out to your local library or book store and read through a ton of 'How to write hit songs" books.
You don't necessarily have to follow all the rules precisely, but stuff written by successful songwriters will give you a great insight into how different lyrics are composed.
There's one book in particular that I keep the top 20 suggestions for writing hit songs. Plus there's people like Paul Simon etc... who 750 words of material on how he wrote specific songs such as 'Celia, Mrs. Robinson, etc.

The one thing I found was that it was really educational to hear Paul Simon go through the methoe he w use to specific 'style' songs.. like 'laundry list songs such as "Hit The Road Jack"

There's severaL books and DVD's that came in handy over the years such as the making Pink Floyd's Dark side