High topolina - welcome to the Developer Forums!
What sort of site are you wanting to make for your travel plans? I'd assume you wanted something where you can outline your plans, and then blog about your experiences. If so, then your best option is to use ready made software such as WordPress - which is a free, very well featured blogging application.
You really have 2 options as to what to do:
1) You could sign up to a blogging site like blogger or blogspot. This gives you your own blog ready installed, ready to go and totally free. The disadvantage is that you lose some of the functionality (probably not too much of an issue), and that you're limited to having the address
http://yournamehere.blogspot.com
2) You could buy some cheap hosting, install WordPress on it yourself, and go from there. The advantages to this are that you can buy your own domain name - anything you like that isn't already taken - and you have complete freedom as to what you can do. The disadvantages would be the cost (~$4/month for cheap hosting, ~$10/year for a domain name), and having to set it up yourself. The setup process really isn't hard though, and there's plenty of people here to guide you through it.
So I'd have a think about those options and decide what you want to do - then we can offer you some more advice about how to achieve exactly what you want to do. Good Luck!