What type of Linux you install will depend on personal preference and what you wish to do with it.
Here is a site that has some links on it for how people installed linux on Toshiba Laptops:
http://www.linux-on-laptops.com/toshiba.html
I found it by searching google for "Toshiba laptops linux"...
I personally use Gentoo Linux - it is fast (if configured properly), easy to update, install, and remove packages (has a great package tool called portage), and is very up to date as far as security patches. These are some things I like about it...other people don't like it and have chosen something else that suits them. There are thousands of posts here on this forum that ask the same question. Try looking at those posts, or perhaps on
www.distrowatch.com
--Mr. Snorfles
--Mr. Snorfles