Magazine advertisements

What’s the best way to send a full page ad to a magazine? I’m assuming Pdf. But with crop and bleed marks?

i tend to do bleed but not crop marks unless i know they are wanted. best to ask them their preference. otherwise send both options…the specs may be online if it s a popular magazine…

If im ever unsure I email them, usually quick response times unless its a deadline day.

Oh one more thing- the website of the publication usually has clear instructions.