Ziggy

I just want to add songs and some voice to create a digital mixtape on a flash drive that will play in a car with USB port. I add songs but they play all at once. I understand tracks overlay, but I don't want that. I want consecutive songs where I can mix endings and beginnings - like to good old cassette days lol. This is all probably very elemntary but I am new to this software. Just loaded free version this morning. Any guidance is greatly appreciated. Thank you - Randy