I'm just putting together an old HP Pavilion 6545C with a Intel 500MHz Celeron in it. I want to install Linux on it, and just want to download a ISO from a site. I don't want to have to pay or go through all sorts of trouble since I don't know what distro I want to use yet. So I don't see paying for a CD now, when I don't know, but I will support the one I go with once I decide.
So I'm just wondering where I should go to find the ISO's I need, and which distro would run well on this old computer? I'm just looking for a simple distro since this will be new to me and I would like to learn as I go with it and not be too overcome by an overly technical version of linux.