I have developed a small card game. It is about geometrical shapes for educational purposes.

I have managed to create some amateur sounds which are not so good, using embeded laptop mic/headphones mic and Audacity. The result is kind of ok but it is mumbling i.e bad quality.

I don't have proper cache to pay somebody to record proper sound effects so this means I have to record something by myself.

What is the best way or which tools should I use to record amateur sound effects with the best quality possible?

I would like to hear your experiences?

Bassically I have words like: Triangle, Square, Rhombus, Trapezium etc...