Advice needed On xc course (equestrian)?

Ok so I'm thinking of going into some low level eventing and working my way up! I've show jumped upto 3ft unaffiliated and trained in xc but have never gone to an event and need some advice on the general 'steps' I guess when your going to an xc event! I've seen some of the GoPro videos on YouTube and they always look like they know exactly where they're going even with different tracks and jumps everywhere! Is there a set course you have to learn, do you get different optional jumps? I'd love someone experienced to take me though what goes on when doing xc! Any little tips or info would be much appreciated:)

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