Your microphone is your most important tool in recording.
Get a good USB mic.
Be thorough in your soundchecks; record, listen back, and take notes.
Know how your mic responds to your voice and others’.
Here are some reminders for when recording in an improvised studio:
Small, irregular, and soft is the perfect recording space.
Use a walk-in closet, a blanket fort, a tent, or whatever works for you.
Here are some reminders for when recording where you don’t have full control:
Get room tone (ie record a minute of ambient sound) to help cover edits later
Acknowledge the space so the audience feels like they know where they are, too.
For a full rundown of home recording studios, including advice on mics and other equipment, we recommend this Transom.org article:
Setting Up a Small Recording Studio