An improving UCO player needs an UCO opening repertoire.
As time and money are limited resources, it is essential to focus on what is essential.
In order to study a new UCO opening, you should learn and familiarize with the ideas behind the opening. This can be done by studying a selected materil on that opening.
These are some examples:
- 1.b4 -> Andy Martin's "Winning with the B Formula" http://www.improveyourchess.com/actionbookawesome.html
- 1. ...Nh6 -> Welling's article on du Chattel's chess http://www.kaissiber.de/html/heftarchiv_5.html
- 1.h3 & 2.a3 or 1...h6 & 2..a6 -> Basman's own booklet "Creepy Crawly" http://www.audiochess.com/
Other more detailed material on non standard openings:
- 1.g4 and an early 1...g5 -> Book "The killer Grob" by Basman
- 1.b4 & 1.e4 e6 2.d4 a6 -> Basman's book "The new St. George"
- Some material on the BDG (Blackmar Diemer Gambit) should be indicated as well, but as I am not well informed on the subject, I do not feel comfortable to recommend books I have not seen.