Hi Linda and welcome. Yeah Ray's right. I don't know of any major publ, that accepts unsolicited unless you have some kind of an "in". There's good reason for that too. For one thing, they don't have time to sift though hundreds and probably thousands of pieces of "junk"to maybe find a gem. It's not "cost effective" + if they don't look at it, they can't be accused so easy of infringing on someones song. Having "access" to it is a main point in a suit.
Have no idea how good your stuff is but best to start at the "bottom" and even then you may be a while getting a publ. contract. I was quite a while getting my first one. (Maybe I didn't write so good <G> )
Ray gives good advice. Most writers start with S W Market. Have you had your stuff critiqued by someone "knowledable?
'Scuse me for running on, it's just tougher than most people think.