Use a folding desk or wall-mounted table
Mount your mic on a boom arm clamped to your desk
Store cables and accessories in a drawer unit or hanging organizer
Rode NT-USB Mini or Samson Q2U (USB)
M-Audio M-Track Solo (small footprint, cheap)
Sennheiser HD 206 or AKG K240 (lightweight)
Use Reaper or Cakewalk β both are light on system resources
Hang a thick blanket behind your mic (DIY vocal booth)
Record off-center from walls to reduce reverb
Lay down a rug or foam mat to absorb floor reflections
Avoid windows and mirrors behind the mic
Record when background noise is lowest (early morning or late night)