How do I.....Follow

While I don't know of a specific write up,I can tell you where to begin.In Kelethin on the same platform as the elf broker there is a Deity Historian.He'll be able to tell you where to find the Prophet of each God/Goddess that has returned to Norrath.I also believe there is another historian on the Butcherblock docks.Once you have found the prophet of your chosen God/Goddess becoming a follower is as simple as going through the appropriate dialog.

Depending on your alignment you can only have a choice of certain Gods/Goddess:

Good:Mithaniel Marr,Quellious and Tunare
Evil:Rallos Zek,Innoruuk and Cazic-Thule
Neutral(Meaning Good or Evil can pick them):Brell Serilis and Solusek Ro

Certain gods blessing and miracles seem to cater more toward certain classes than others.

Ahh,I found a good post about them on the EQ2 forums:HERE

And here is a list of all their Blessings and Miracles:HERE

Hope this helps.