Allow me to share a couple of thoughts since I'm probably the kind of person this is aimed at and will probably sign up for it.
Focus on a few specific outcomes. Decide what hobbyists going to want to be able to build and focus your attention on teaching us how to build those types of circuits. While you are doing that it would be a good idea to have vectors which go into more detail like good books, websites or videos which do more into the fundamentals.
Some of the things that I think are good basic skills and topics:
1. Basic electrical and electronic terms and formulas (ohms law, etc.) Make this one free? Add how to use basic kit you will use when building circuits: a multimeter, breadboard, leads, wire.
2. Simple LED blink lesson using a 9V battery, an LED, a 555 timer and fixed resistors. Use the multimeter to probe the circuit, discuss LEDs and the 555 timer IC.
3. Change the circuit by adding a pot and a low side N channel MOSFET and a couple more LEDs making it an LED dimmer. Talk about N-channel MOSFETs as simple switches. Introduce basic schematic drawings and how to read datasheets.
4. Drive a small DC motor with a half H bridge constructed using N and P channel MOSFETs. Talk about inductive loads, talk about diodes, expand on LED discussion before.
5. Expand on #4, make the motor control circuit a full H bridge. Use an Arduino Uno to do PWM motor speed control, a tactile switch to do motor direction control, braking and freewheeling, etc. Add a voltage regulator to power the Arduino and motors from different rails.
6. Build a simple single output low voltage project power supply using all the components introduced so far. Introduce amplification, BJT transistors, dissipating heat with heat sinks. Dump the Arduino for an ATmega328. Connect an I2C LCD display and discuss serial bus.
7. Expand on #6, Build a variable bench power supply, Introduce op amps, negative voltage, explain constant voltage, constant current, "noise" effects, introduce the oscilloscope and how to connect it to the circuit and use its basic functions to probe the bench supply.
8. Wrap up. Design the PCB for the bench supply, get it made (OSHPark?), solder all the components, through hole and SMT, and put it in a project box ordered from Digikey (sponsorship opportunity?) to make a complete hobby bench power supply with LEDs, load switch, LCD readout and binding posts.
That would be the general lesson plan if I were to choose it. I'm sure there are lots of other opinions out there about what is important and I'm sure I've left stuff out but this gets a student to:
controlling and powering LEDs, using Arduino and standalone micro controllers, driving and controlling DC motors and basic DC power supply construction as well as enough theory, tools and foundation to design these types of circuits on their own.
I could see a couple of intermediate tracks from here, lighting, audio, toys and robotics, etc.
8 weeks, $99. Include a box of parts students will need to make everything except lesson #8 and the Arduino. You could skip the Arduino but a lot of people will encounter them so having a small introduction would be good so people know what they are about and can decide if they are appropriate for their projects.
Hope this is useful.