The data sheet is like the manual to understand the parts and how the microcontroller works. It can be find in pdf in this adress: http://www.atmel.com/images/atmel-8159-8-bit-avr-microcontroller-atmega8a_datasheet.pdf

For example in pag 13 you can find a diagram of the pin configuration, as you can see in the image bellow:

With this diagram you can design the board and know where to place everything according to the microcontroler pin that it should.

So I started working on the Hello Board I did on week six.
First I downloaded the Arduino IDE

From this site: https://www.arduino.cc/en/Main/Software

So first I had to burn the bootloader with help from the ISP from week four.
After several tries I couldn´t burn the bootloader, the teacher told me it could be because the paths were not very neat. So I did a new one.

First boad:

Second board:

With this board I could burn the bootloader

So then I decided to try the blink exercise, but as I was putting the ISP cable again The paths broke:

So, I started once again.
Eagle:

Board:

Then I milled it and did the soldering, upload the bootloader And did the blink exercise changing it from the pin 13 to the pin 7.
This is the arduino code:

Result:

Finally done!

cambiopin.ino

hello_2.brd hello_2.sch