The only time you're likely to use things like C flats is when you want to play somehting like a Bb Locrian scale. The locrian scale has a flattened 2nd, so you need to flatten the C to a Cb. You don't call it a B because you already have a B note in your scale (the root, Bb). In scales, you never have two notes in the scale with the same base name – ie. you can't have a Bb and a B, or a Db and a D#. this is why some scales can get to things like an Ebb – in other words, a D – to keep it like that, but it's rare that you play scales like that. Glad I could help you, it was tough working out what was going wrong, but I agree it can get pretty confusing. Remeber, you flattenthe note, you don't make it a flat.