Do you have any pdf links to all these items? Where they came from? Specs on the motor? Pinout of the boards?
If you can find the docs, try powering and programming the AVR only first, to maybe send a "hello world" back to the terminal or toggle a pin if you can measure it some way… This checks for the integrity of the programmer and board.
that says the device is "Pony Prog compatible. So when you download whatever AVR programming software, you should be able to select that option when you are ready to program and your device should load.
There really should be some better documentation on the devices somewhere, as there is little indication of what microcontroller pin goes to what location, other than using a meter. There is also a problem in knowing whether the realy board has some sort of driver for the coils, or if it requires something like the L293D to drive them.
I’m afraid I’ve taken the libery of renaming your thread. If I didn’t, we would have about 200 topics all with the title “Please help me make my first robot.” This have given you robot a personality, already! Nicknames are so much better when they’re given by friends! (It’s not offensive - most of our bots are made from salvaged junk!!)
Anyway, I’d say you need to consider control. If you wanted to use that chassis as it is, it would have to be skidsteer. You do say you have a castor. I suggest you use it and take off that pair of unpowered wheels.
Your 293 board: was it designed for to be used with these motors? You need to decide if you’ll be using the relay board or the 293 board. You’ll not use both. If I had to guess, I’d say C1, C2, C3 and C4 are the control wires for the relay solenoids. I would guess that two of the relays are in a crossover configuration (ie, they revers the polarity of the motors) and the other two are just used as on/off.
With the relay board your robot will accelerate an decelerate very rapidly. The 293 board would allow more control (assuming it can handle the motor current).
Looks like you have to learn Atmel programming. I can’t help youthere, but plenty of folk here can.