How to improve sound quality

When speaking to others online this is fine

This could be a result of compressed bandwidth that typically occurs with voice-over-tcp/ip software solutions.  This could be masking the humm and clicks problems you have (but I cannot say for sure).

As far as sound quality for your input, you should really get a good external audio interface.  An example of a decent budget audio interface is the Focusrite Scarlett 2i2.  This is a usb interface and supports microphones that require phantom power.  They will typically sell used on ebay for anywhere between $50 and $130.

There are obviously much better audio interfaces, but based on your microphone choice, you want a budget level solution.

Could be a problem with different sample rates/bit depth. Are the audio settings  the same for recording and playback?

I think that this is an audio forum. Only robots ask computer questions.

Lotso luck.

I may be wrong, but I am not sure this is the ideal place to ask your question. A forum that is specific to perhaps recording engineers might get better results.   

Either way, good luck.