When recording an interview, there are several inexpensive and simple options. One option is to have a dedicated phone line or high-quality Internet phone service for making your calls.
Get a VEC TRX-20 3.5MM Direct Connect Telephone Record Device (ADAPTER ONLY). It plugs into the handset and cord. It comes with a mini jack that you can attach to a recording device or your computer. From there, you can record the conversation.
If you do not have a dedicated phone line, I recommend Skype and the Free Skype Call Recorder for recording the conversation. When you use this recorder, make sure you set the bit rate to 128 and mono, for the best recording quality. Be aware that Skype calls can have limitations, depending on the time of day and the type of Internet connection you have.
A third option is to use Skype in combination with Vodburner. You can use this software for the PC or Mac. It allows you to make blended audio recordings, separate audio recordings for both sides of the conversation and side-by-side video.
To record your voice, there are several options.
For a headset, I recommend the Plantronics GameCom 780 Gaming Headset with Surround Sound – USB Compatible with PC.
Another option is a lapel microphone. I recommend the Sennheiser ME 2 omni-directional lavalier EW microphone. This will improve your appearance on video. You can use ear buds for the audio or turn down the sound on your computer speakers to minimize feedback.
Other options are microphones you would use for podcasting. One option is the Rode NT1-A Cardioid Condenser Microphone Recording Package with Free Round Base Desk Stand.
The microphone I use is the IK Multimedia iRig Mic HD high-definition handheld microphone for iPhone iPad and Mac.
Some microphones will come with a pop filter. With others, such as the iRig microphone that is an extra item. One option is the Dragonpad pop filter Studio Microphone Mic Wind Screen Pop Filter Swivel Mount 360 Flexible Gooseneck Holder.
One option for holding your microphone is a table stand, like this one from Hamilton Nu-Era Tabletop Mic Stand.
Another option is a microphone stand with extending boom. I use one similar to the Pyle-Pro PMKS3 Tripod Microphone Stand W/ Extending Boom.
After the interview, you will probably want to edit the audio. A free solution is Audacity.
Questions? Write to me.