Is there an authoritative source(s) used by Independent Fundamental Baptist Pastors/Churches when researching the positions/views they hold on both doctrinal issues as well as other topics of interest within this type of church?
I think the trouble you'll have with this is in the name: they're independent. So there is no centralized governing body. Most point to the King James version of the Bible as their authority.
There are a variety of blogs that will give you information about these churches, but there is no guarantee that all IFB churches will adhere to everything any given blog states...or that even that the blogs will agree with each other.
IndependentBaptist.com
In general, what you'll find in the IFB is roughly something like this: a service consisting of songs (hymns and gospel songs up to roughly the mid 20th century) typically with piano accompaniment though some will have organ/orchestra, prayer, and a sermon. This will likely be followed by an altar call. Men in coat and tie, women in skirts. There may or may not be a dedicated choir.
The typical service schedule will be twice on Sunday (AM/PM) and Wednesday night. There will be a Sunday School session for both adults and children at some time during the Sunday morning activities either preceeding or after the worship service.
Doctrinally, they will be OSAS and adhere to adult baptism by immersion at an age of accountability. As far as eschatology, they believe in a pre-tribulation, pre-millenial rapture of the church. At one point, some of the IFB decided to throw out Numbers 12 and bought into a unscriptural concept that dark skin was the curse of Cain and as a result race mixing was banned...but I have no idea how widespread this became. The idea seems to have died out after the Bob Jones University
kerfuffle.
Much of the doctrine of the IFB movement was shaped by the study notes of the old Scofield Study Bible, though I think most of them today are actual seven day creationists instead of gap theorists like Scofield himself.
Evangelicalism could learn a great deal from the steadfastness of the IFB. There are many saints in that movement who sincerely seek to follow Jesus. Ultimately, after a deep dive into church history, simply wrapping the Zwinglian/Anabaptist faith and message in a mid 20th century wrapper wasn't enough for me.