I have some questions...

Where do you buy condoms?
Do you have to be 18 to buy them?
Got any tips- like Dos or Donts???

Well I don't know where you live, but as far as I'm aware nowhere has a minimum age at which you can buy condoms. But to be honest, if you are that clueless about the topic, you really need to ask yourself whether you are ready for sex. If you are thinking about it, go to a family planning clinic- you can get free condoms there, they will probably give you advice about putting them on properly and they might advise you about other forms of contraception to use alongside it, because condoms aren't exactly fool-proof, particularly when used by amateurs. Sex is fun, but you have to think long and hard about whether you are ready for the possible consequences (incurable STDs, babies etc) and whether you know enough about them to avoid them.

You can get them at any drugstore or gas station or grocery store. And no, they don't card you trying to buy condoms. If you want more exotic or specialty or high tech ones try a sex shop like Babeland.

Exactly what I was going to say.

You don't have to be 18, you can get them almost anywhere and maybe you should just go through this thread for advice.. Or ask specific questions.. How old are you anyway? Because most 7 year olds I know what sex is..