Start with How To Install Wireless App Controlled Switches and Receptacles (21 min, Electrician U), then Terminating/Testing Network Cables - CAT 3, CAT5, CAT6, CAT 7, CAT 8 (26 min, Electrician U). All 5 lessons here are free, from the teachers' own official uploads. You'll need network cable tester, rj45 crimp tool kit, fish tape (about $80 of kit). The book to keep beside you: Ugly's Electrical References by Charles R. Miller.