1. Depends if you'll use them or if they'll sit in a drawer. If you don't know what you need or why, it'll be the latter.
2. For graduated filters, square is the way to go. For NDs, either can work. If you're ONLY using a CPL (like I do), then circular is more compact.
3. Depends what you need for what you want to do. Landscapes would generally call for some graduated filters, but if you don't know why you'd want them then they won't get used.
The model of camera you have makes no difference to your question. The lens will determine what filter size you need.
Read some guides t determine what various filters do, to determine what you might need/want and start small.
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