To be honest, I don't think it matters so much whether a dog is a person's "first dog", so much as how prepared and knowledgeable you are (or are willing to quickly become).
A friend of mine had never had a dog before, but she's brilliant with her Husky mix. On the other hand, an ex of mine had dogs for years, but she was absolutely crap with them and didn't train them at all.
I have a working Cocker.
He's super fizzy, bouncy, awesome, fun, loving, madly affectionate, insanely clever. He learns tricks within minutes. He understands actual sentences. He knows the names of different toys - even down to the colour of specific balls. He's not necessarily "easy" to train - because he's mischievous and gets over-excited - but he's so great to communicate with. He's like a little person, with a massive personality, and sooooo so sweet.
I didn't want a Cocker, but now that I have him, I honestly feel like any other breed might disappoint me, because he's just SO excited about everything, and that's infectious. He's just so special.
I think you'd be fine with a Cocker! Show line, if you want a bit less work. Working line if you're up for wild energy and a challenge. You'd want to allow about 2-3hrs a day for walking, training, grooming, activities, games, etc.