Look at KiCad (open source) or Eagle (free to hobbyist) for a schematic capture / electronic design. But for a starter in hobby electronics, you might start by

Look at KiCad (open source) or Eagle (free to hobbyist) for a schematic capture / electronic design. But for a starter in hobby electronics, you might start by following a blog like "Dangerous Prototypes" or "HackADay"