Before you consider an amp, you should have a decent electric guitar as the amp will only amplify the sound and tone of the guitar - if it’s good, the amp enhances it; if it’s bad, the amp enhances that too. Choosing the right electric guitar will depend on many factors, such as; budget, intention, and experience level. If you stick with well-known names, such as Fender, you’re likely going to get a good-quality guitar that will work well with the Fender Mustang III.