I started off building the electronics projects in Cub Scouts. Then I started building my own transmitters as a Ham Radio operator.
I tell my new technicians they should get a CMOS, or TTL, or OPAMP Cookbook (they are all available on Amazon) and start building the circuits they are explaining and see if they work. Or, for example there is "Electronic Project Building for Beginners " (< $6 on Amazon) or hundreds like it that walk you through the process.
There are lots of schematics and projects on the web. You should look for one that interests you and build it. There are lots of people that can help you, this format for example, so you would never be stuck.
Go to www.mouser.com and ask for their catalog. It is the best and cheapest way to buy stuff, and you can order only one, if you want.
Also, find a Ham Radio operator near you. He/she is building stuff all the time. You learn a little at a time