Talking about pages is neither here nor there. There's too much scope for variation depending on book format, font, layout etc. Better to talk words. You need to hit about 75-80,000 words to be publishable and for a first fantasy novel I'd say higher - maybe 90,000. Don't go much over 120,000 for a first novel or you'll find it a hard sell unless you have a fan base already from other work, either short stories or RPG stuff.
If you must think of it in pages then 75,000 will be about 300.
D.