For tench I use the same method almost where ever i fish, A light wagler, 2 to 2AAA (Use the lightest float you can for the position you need to fish) all the shot up top except one small no. 4 or 6 about 4" from the hook, set so this shot is just off or just touching the bottom, Make shure the float is shotted right down so that only the tip shows ( I quite often use the longer tips 3" to 4" long), Look for features, Weed beds, fish as close in to them as you can, Reeds, same again. Tench love the margins in the summer, so try in close. most of my best fish have been hooked under the rod tip quite often in less than a foot of water
Best baits corn fished on a size 10 or 14, Bread moulded hard on to a 10 or 8 ( but leave the tip of the hook exposed) bread balls sometimes work well
As for grounbait, very rearly, just loose feed corn, or small bread balls, a small amount per cast, depending on how the fish are feeding
Only use ground bait if the fish are not responding, but only in small amounts
For groundbait try this Soak and mulch bread, add bran to stiffen just enough to get it to go where you want it, add some hemp if you like, but beware, tench can become pre-occupied in it.