Hey Reagan -
There are any number of books out there available through public libraries and bookstores. And a search for such literature on the internet would likely locate several million sources for you.
But I would imagine that if you were to check with organizations like the National Association of Royalty Owners (NARO) (www.naro-us.org) or the Texas Land and Mineral Owners Association (TLMA) (http://www.tlma.org/ (or similar groups for your state), they will have recommended books and other literature for you to choose from - perhaps even seminars for you to attend.
Hope this helps -
Charles
Charles Emery Tooke III Certified Professional Landman Fort Worth, Texas