Should I Switch From Windows To Linux

I am not a technical person but am a sole business owner trying to muddle through this. Your help is much appreciated.

I want to combine my www with non www site via a 301 permanent redirect. My goal is to combine my page links in hopes that one day Google will increase my page ranking (which is sadly at 1). I don't think that combining them now (about 100 links each) will do anything to my PR but I do want it set up properly now so it's all set.

I have been reading all over the Internet on how to do this and working with my site host: Go Daddy. It's been a struggle but I believe that because I'm on a shared Windows server, there is not a solution for me to do this. If I was on a dedicated server I could do it through IIS but that option is not available for those on a shared server.

A posting I read from someone else who is also on Go Daddy (on another site) said he went and transferred his site from Windows to Linux and then was able to do the 301 redirect.

I don't understand what Windows, Linux, Apache, etc. means. My site is very simple: advertisingspark dot com. Can I transfer to Linux? Should I transfer to Linux or Apache?

Is this going to be too complicated for me? Or should I have someone else host my site? My annual fee is due in about a month so it's a good time for me to switch if I should.

I don't know if it is relevant but I had a website designer create my site and then I edit it myself in a cheap editing tool. I know basic HTML (I'm sure my designer is cringing!) If I switch to Linux or Apache, can I no longer work in html files?