What are you planning to use for audio? Do a dry run and listen carefully. Most rooms have a lot of reflections and the audio ends up sounding like its recorded in a bathroom. Acoustic treatment from moving blankets to sound absorbing panels can help a lot.
A decent mic can be had for around $100. The soundcard in your computer is generally junk. There are USB audio interfaces for less than $100 that can also make a world of difference.
If you are recording video separate from audio, remember to start the audio recording first and then make some noise, like a clap, so it's easy to sync things up later.
Then decide on your editing software. There is some free stuff out there (Audacity for audio is popular), some for a little money (Reaper comes to mind), and then more expensive versions.
Rendering / editing video can be resource intensive on the computer. RAM and video + a SSD speeds things up.