mereflesh - Ther have been many discussions about Banjos in the forum. If you go to the Threads front page and find the box named FILTER, type in banjo and in the box marked AGE click to 1 year, then click on the REFRESH button you will find a list longer than your screen. Some might be helpful, others not, but they are there.
One thread entitled Celtic music on 5 string banjo may have some of the information you require. Here is a link to it . There are a number of banjo websites mentioned in various threads, but I have been to busy to do more than just bookmark some for later assessment, so I am not sure what they contain. One which looks like a possible good starting point is The Banjo Hangout. It contains various resources and also links to other banjo sites.
It might also be worthwhile putting requests for specific tunes/songs as separate forum requests.
A lot could depend on what style or technique of banjo playing you use, and also if you are a complete novice, or already play banjo but wish to diversify. Give us more precise details of what you need to know and we may be able to give more specific help. If you give a country of residence, there might be a Mudcatter with local knowledge of somebody who can help you.
Quack
Geoff the Duck!