For the holder get an el-cheapo from ebay, it's just a piece of plastic with a metal ring. Get the rings for the lenses you use.
For the filters you want really good ones, IMHO the best ones are Sigh Ray (Expensive) then Hitech & Lee have really very good quality. Cokin is not so good and the chinese filters are useless.
For sunsets and sunrises you probably want a reverse grad filter, one that is darker at the horizon. You can search for them at B&H Singh Ray has excellent reverse grads.
Having said that always consider taking 2 shots, it's the same as using the filter but you can do the transition in any way you want at home.
Hope to be helpful
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