ESO and BACHILLERATO. Keep your own blog, some security tips for students.

In order to keep your blog, set up an e-mail address which does not reveal your true identity.
Although you don't reveal it, the police can find out who you are, so be responsible for what you write on the blog: never post anything offensive to people who you know, specially teachers: what you do online can get you into real trouble in your real life.
Think about the future: even if you don't think the content in your blog compromises you now, it could eventually do so.
Never arrange a face-to-face meeting with someone that you have met online.
Never post pictures of yourself to people you do not personally know.
Never give out identifying information such as address, personal e-mail or phone number.
Never download pictures from an unknown source, as there is a good chance they will portray pornography or violence. The Google Image search engine is normally free from this content.
Never respond to messages or bulletin board postings that are suggestive, obscene, belligerent, or harassing.
Be suspicious of information you see online-it may or may not be true.
Don't let your online life substitute your contact with the outside world: keep meeting friends, talk to and hug your friends and relatives.
Don't spend long periods of time online, especially at night. Share with your parents everything you learn online. Don't hesitate to ask teachers for help.
Don't rush to be an adult, it's fun being a teenager. You'll eventually turn 18 and you will be able to access all that now is not recommended for you.
Never accept mail, gifts, money or packages from someone you don't know. Don't let adults other than your parents refill your mobile phone credit.
Show your parents your progress with the new technologies, show them you can keep your own blog: they will be proud of you.
Never try to pretend you are someone else, using other people's identity: this is a crime, so this can get you into serious trouble.

Tips for creating your own http://www.FICTIONALNAME.blogspot.com/ blog.
Go to blogspot.com and follow the instructions. You will need a valid gmail account, remember to use a professional one which does not reveal you identity.
Choose different layouts and start writing!