What most naturally follows?

How to learn spanish with audio lessons
Purchase language-learning software.
Choosing which software or program to buy can be a bit overwhelming because there are so many choices, each with their own strengths, weaknesses, and goals. While there are definitely some popular software, and more expensive software, brand and price are not always indicative of the program itself.
Your best bet is to look at program websites and read about each, then look up reviews, and ultimately decide which program will best meet your learning needs and goals. There are excellent free programs available, which you should not overlook.