I second the suggestion of WordPress. They have a great spam filter and you can do adult stuff there. LoveSandra is right about not going into an oversaturated niche. You'd be competing against too many people there.
If you're going to be writing the blogposts yourself then go with something you know and like. You'll write the best posts about what you love the most. Visit other blogs and emulate what you like. Don't copy outright but get a feel for what other people are doing. It's going to take a little time to get it right so just start doing it. Your first blog doesn't necessarily have to be your big success.
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