an address with the format http://salemioche.net/mydirectory is the best case scenario because some host providers will offer you a much more complicated path such as
example of a free host provider: www.multimania.com
with the format http://mydirectory.salemioche.net, is better than the previous option. This kind of address is offered by some free host providers such as free.fr. You can also benefit from this kind of address if you make use of a service for free domain names
with the format http://www.salemioche.net is our preferred option! For this you need to pay a rental charge (around 15€ for Acheter un nom de domaine) which gives you the right to use this domain name. Next you need to find a host provider who will accept to host your website (this involves their DNS configuration).
For more details concerning domain names take a look at buying a domain name
If you're motivated enough to create your own website, invest a minimal amount and buy yourself a domain name and a web hosting. Your website will look much more professional and your visitors will have a better opinion of the durability of its contents - and therefore will be more inclined to bookmark your website in their favorites.