You will love those books. Especially the Little Dog book
Don't get me wrong, Loki and I did training classes. The first one or two were necessary. The rest were for fun but what he learned, he learned mostly at home. We went to class, the trainer answered our questions and helped us so we didn't feel totally alone and then set out to teach us 1-3 new things (like come, sit, stay, leave it, walking nicely on a leash) then we went home and did "homework" (Loki still knows what word!!) She taught us how to have a good relationship with our dogs and how to communicate with them. I've taught Loki many things beyond the classes using what I learned. The books I recommended use the same philosophy as Loki's trainer. The "Little Dogs" book even explains in the first chapter what you should be doing at 3-6 months, 6-12 months, etc. It's a great book, and it's only 100 pages. Pat Miller is my FAVORITE trainer. Her book is a lot more detailed and not as cutesy, but it's extremely informative! And I just personally think Victoria Stillwell does a good job explaining why most dogs do better under a positive (reward-based) training system.
You have to use every moment as a "teachable moment" Have her sit before you pour her food, before you pet her and before you put her leash on. When she is outside, you need to reward her every single time with a treat for both pottying (immediately - you'll need to go outside with her until she's reliable) and when you call her to come. ALWAYS treat with come. You want her to come no matter what. Mine don't, because I didn't learn that soon enough. I just go outside and yell "BREAKFAST" and they come running! LOL But the word "come" never worked for them because you use it all the time. A lady in class taught her dog "DANGER" and gave him Cheetos as a treat for that command only. He had that down in like 2 tries - he didn't want to miss his Cheeto!!!
Anyway, can you see how training should be fun? I could yell "homework" right now and my two would be at my feet ready to work for a treat. (Sam doesn't know the word, she copies Loki! LOL) It's a game. You should still do a training class just to address things like chewing, housetraining, etc. but you can do a lot on your own as long as you have the initiative, which you obviously do!