Can someone tell me how to place widgets/photos, etc. on both sides of my blogger page?

Hoping someone can help with this.

I have a blogspot page that is now converted to a .com. I used the templates, etc. used by blogger to do this. I like them and do not want to change the design as it is really nice and I worked a lot on that. Right now, my template only lets me put widgets/photos etc on the right side of the blog postings. (This would be widgets for outer links, videos, “Previous Postings” lists, etc that are not directly related to that particular posting and stay permanently there while I post.) There is a huge space on the left side that could also be filled with widgets/photos that get buried too far down on the right side.

Any idea how to post widgets on the left side of a blog…so that you have widgets/photos/links on both sides of the
blog entries/blog posting body? And especially how to do this without disturbing the basic design as it stands?

Thanks so much in advance….....as always!