Are you wanting to design them, then have a company make them and send them to you? If so, you can go to https://www.expresspcb.com and download their free software. The catch with the free software is that the output files can only be used to order from them.
Eagle has a free downloadable version which outputs standard files, so you can get them made anywhere, but the boards are limited to small sizes.
If you're actually going to etch your own boards, that's something I have not yet done.
in my tutorials section there's a PCB tutorial. It's not exactly finished but should be enough to get you started... in the first paragraph is a link to the original toner transfer method tutorial page.