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depending on species mate. My ray mark is flat, no bumps whatsoever, but just thick mud. Mullet, gars, maccy, bream, dogs, smoothound, pack tope can be caught over any bottom.
A rocky outcrop, or lumps and bumps on bottom will help if you target conger, bass, wrass, bullhuss, etc
Bait is important, but squid will take 95% of the species we target. Terminal tackle wise, you can get tecnical but a simple running rig will take most species.
Keep asking the questions mate, the lads in here are very helpful.