What format should SD card be for RetroPie?

According to the SD specifications, any SD card larger than 32GB is an SDXC card and has to be formatted with the exFAT filesystem. This means the official SD Formatter tool will always format cards that are 64GB or larger as exFAT.

How do I put roms on my Raspberry Pi SD card?

Re: Adding Roms Directly to SDCard Plugging a blank flash drive into the RPi and booting up causes all of the rom folders to be written to the flash drive. You can transfer roms by placing them in the correct folders and plugging into the Pi. The roms are automatically copied to the SD card.

How do I put games on my Raspberry Pi?

Place your Raspberry Pi into its case. Download the RetroPie SD-card image. Format your SD card to work with Raspberry Pi. Install the RetroPie image. Put the SD card into your Raspberry Pi and connect your peripherals. Connect your Pi to the Internet. Expand your SD card to utilize all usable space. Connect to your Pi.

Do I need to install Raspbian before RetroPie?

You don’t need it. It’s just another way to install RetroPie and the Raspbian OS it uses in one go.