Inside Roblox Studio, you can create new games by clicking + New tab on the left hand bar. This will bring up a series of templates for you to work from that can be sorted by theme or gameplay style.

Image format .png, .jpg, .tga, or .bmp can be uploaded to Roblox. The next step is to upload it to the platform. Head over to the Roblox Studio and select the Asset Manager option in the View tab.