The common term now for video software is "Non Linnear Editor" or NLE. There are thirty or so on the market. When I started my video addiction I decided I would get the best. I went through about four and was getting nowhere pretty rapidly.
Looking for the best or easiest was keeping me from getting anything done.
I decided that any one of several NLEs might be good enough. For three reasons I picked Adobe Premier Elements. A "youngster" I know works there, the retail price is about $80 and there are learning resources everywhere. I started with 9 and am now on version 11.
Now that I've learned this one NLE, I can't imagine anything being easier. Trimming the ends or cutting clips into pieces is quick and fast. It can be done with the mouse or keyboard shortcuts. Trimming can be done in a preview or after it is on the timeline. You can drag the ends or chop them off.
Getting rid of audio for any clip, or a selection of clips takes three steps. You "disconnect" the audio track from the video track, select the audio track or a selection of tracks and press delete. Adding an audio track is done by adding the audio track file to the project and dragging it to the timeline. There can be 99 tracks! I've done up to three and independently adjusted the volume for each so that narration comes in as background music fades. The first time I did it, I got a small headache. Now I can do it and drink beer at the same time.
I've never made an .avi file, so I tried it. It worked by only selecting it from list of menu choices. I prefer to do all the work in the project in the highest format my cameras can produce and my computer can handle. For me that is "AVCHD 1080p60". When the project is done, I can output to everything I've ever heard of with Adobe provided presets, or I can make my own. This afternoon I completed a project about a family wedding two years ago. The couple has forgotton I took any video. Their 2nd aniversery is in two weeks and I'm going to surprise them with a DVD as a present. In this case I shot AVCHD 1080i and am producing a Blu-Ray quality AVCHD Disk on an ordinary DVD+R. It was easy.
If you want to see how Premier Elements 11 works, there is a free 8 part tutorial here: http://muvipix.com/products.php?searchphrase=basic+training&btn.x=12&btn.y=10
You should be able to get through it in about an hour. Look for "Premier Elements 11 Basic Training". The same guy does a $25 course at lynda.com that will take you a couple days that will leave you with a high understanding of how it functions. Adobe will give you a free 30 day trial by download. There are a number of good books and lots of random YouTubes. There is a place called "Adobe TV" that has a couple dozen videos explaining how to use Premier Elements.
Another favorite NLE for many is the Sony consumer version of Vegas. I know nothing about it, but many say it is very capable. I don;t think there is anywhere near the learning opportunities. I have now real data, but I think that between Premier Elements and Vegas Home Studio, the rest of the 28 NLEs may be in the bottom half of the market. But, there are others that have their fans base.
I don't think you can find anyone, anywhere that has in depth knowledge on more than one NLE. When I read professionally written reviews, they usually have a number of flaws when they write about the only one I know. Because video editing is not a casual process, nobody takes the time to master more than one so can't get expert comparison advice.
FWIW, I am a vet. I'm a Navy pilot from the Viet Nam mess. It would be nice if I could say we accomplished something there, but I don't think we did. Accept that we learned what "polarization". Half the country learned to hate the other half based on the single issue of the war. I wanted to be a pilot. I lost a lot of friends who saw me as a lover of war. When I got out after six years I couldn't get a job. I was thrown out of an interview for a job delivering small aircraft when I "confessed" to being a Viet Nam pilot. I will say I had a good time. Happy Hour drinks were $.10 in the Officer's Clubs everywhere I went.
Good luck with your project. If you do decide on trying Premier Elements 11, let me know if I can help you get started.