Your next book should be centered on database and, probably, web-based programming. I assume that examination of futures trading has got to be based on some manipulation of historical data as well as current trading data. That data is often DB-oriented. There are lots of vendors of stock data that provide it in different formats, but CSV (comma separated variables) is very common and many programs offer it as an output option (e.g., Excel). This would suggest some work with plain text files, too.
A starting place for selecting a book is Amazon.com. In the search box, type in Database Programming and then examine the list, reading the reviews for ones that look promising. Do the same for web programming. Then, if you can, call some local book stores and see if they have your choices in stock and then peruse them in the store. Pick what looks good to you and start reading and designing at the same time. Think about the design for your program as you read, making notes to yourself along the way. By the time you finish a couple of books, you should have a pretty solid design from which to work.
Keep me posted...
Jack Purdum, Ph.D.
Author: Beginning C# 3.0: Introduction to Object Oriented Programming (and 14 other programming texts)