I am taking online courses with an AVMA-accredited school in New Mexico that offers an AAS degree in Veterinary Technology. The main textbook we use in the first level is McCurnin's "Clinical Textbook for Veterinary Technicians" 7th Edition by Joanna M. Bassert and Dennis M. McCurnin. You can buy it along with the workbook through amazon.com (about $90), or you may be able to check out the textbook through a library. The book covers a wide range of fundamental concepts and info -and it has photos, too.
There are many topics studied in a VT program, and the ultimate goal is to finish with the degree in order to sit for the VTNE and become credentialed (certified, licensed, or registered) in one's state of practice.
The job market everywhere is sad, and if you have an opportunity to gain hands-on experience, then go fo it! I wish you the best of luck helping critters in your area.