Select Alternating Columns With Unknown End Point

Okay, so I have been googling to figure out how to write a macro that will select every other column on my workbook. All that keeps coming up is conditional formatting, which I do not want. I am not trying to highlight the columns in alternating colors, I just want to select them.

I am starting at column F and I would like it to search until the end of the columns and select every other column ending with the last column with data in it.

I know I could search by a specific row and tell it to find the first blank cell then offset it, but there is no particular row that will always have data in it, so I guess it needs to check by column until it finds the first column without any data in all rows and then offset it.

Anyone know what I am talking about here?

I know it should be fairly simple but I couldn't seem to find any answers anywhere else.

Also, anyone know any good websites that have definitions for some basic macros? I'd love to start learning how to write this stuff on my own.

Thanks.

-Amy Kate