How to Make Your Own Game Console : 6 Steps (with Pictures ...
In this step, we'll be doing some configurations in RetroPie. So first, insert the microSD card in your Raspberry Pi; connect the HDMI cable, one side in the Raspberry Pi and the other side in a TV or monitor; connect the power supply in the micro USB connection and then boot the Raspberry Pi.
1. First Boot
That is the first image that you'll see in the first boot. It will ask you to hold a button on your device to configure it. If you're using a Bluetooth controller (for example the Nintendo Wii U Pro controller), you'll have first to configure a USB keyboard and later configure the controller. If you're using a USB controller, hold any button and start to configure it.
2. Configuring a Bluetooth Controller
To configure a Bluetooth controller go to the configuration menu with the keyboard and select Bluetooth.
Now select Register and Connect to Bluetooth Device, it'll search for your Bluetooth controller, at this moment you have to press the Sync button to synchronize your controller with the Raspberry Pi, (this button in the Nintendo Wii U Pro Controller is the red button located on the back). Then select your controller and select the NoInputNoOutput option in the next screen. Follow the images below.
After that, go to the main screen in RetroPie, press the start button to open the main menu and select Configure Input, then hold any button on your Bluetooth controller to be detected and configure it. Once configured, your Bluetooth controller will be working.
3. Configuring the Wi-Fi
Now in this step, we'll need a USB keyboard to configure the Wi-Fi. So go to the configuration menu, select Wi-Fi, select Connect to WiFi network, then choose your Wi-Fi network and put your password.
4. Installing others emulators (need an internet connection)
RetroPie comes with more than 50 system pre-installed by default, but there are much more emulators that you can install and isn't installed by default. To install more emulators go to RetroPie Setup in the Configuration menu, and first of all, select the option Update RetroPie-Setup script, and then go to Manage packages; in this section, select Manage optional packages, and you'll see a lot of emulators to install like PPSSPP (the emulator for PSP) and Reicast (the emulator for Dreamcast). You can also select Manage experimental packages to install some emulators that are being tested like Drastic (the emulator for Nintendo DS), and you can even install some ports like Minecraft Pi edition. After choosing the emulator that you want to install, select the option Install from source and wait a few minutes for the emulator to be installed. Follow the images below.
*These are only some basic settings in RetroPie, but you can explore and do a lot of modifications in it.