Setting up your recording space and equipment are of the utmost importance.

One of the most important factors to control for in your recording space is reverb. If you are in a large room with hard surfaces, high ceilings, and lots of space, the sound of your voice is going to reflect back and hit your microphone multiple times.

The absolute best starting spaces for recording are small, carpeted closets:

Your clothes act as a sound barrier on their own, which in addition to their small size is why closets are so convenient. Any empty spaces or hard surfaces (including your desk or table) can be covered with blankets, towels, or acoustic foam to complete the effect of a sound booth.

If you don't have a closet large enough to accomodate you and your recording equipment, you can very cheaply assemble a do-it-yourself recording enclosure, or pay a bit more for a ready-made one.

These setups won't dampen sound to the level of a professional recording studio, but it'll be very close, and they will minimize outside noise. Professional audio tools can automatically clean up any small, lingering sounds.

It's possible if you don't have a suitable space in your home, that you may need to borrow one from a friend, or rent studio time.