I'd probably find a nice light-style beer recipe as my base for constructing a beer like this. Maybe a pilsner or a light ale style. There's a lot of variety of extracts out there these days (more and more every day) so you can definitely keep it an extract brew. For a 5 gallon batch, i'd probably do an adjunct grain steep using a pound of crushed 2 row malt, 4.5 ounces of 60L caramel malt and a light pilsner style LME or DME for the bulk of the malt (6.6 lbs). I'd use some noble, low alpha acid hops like hallertau or saaz for the bittering/aroma/flavor and keep the ratio light, maybe 1 ounce bittering, .5 ounce flavoring and .5 ounce aroma.
Peppercorns can be overwhelming if you use too much. I'd probably experiment with about .25 ounces of crushed peppercorns at 10 minutes left on the boil clock. I'd have to use fresh South Carolina McBee clingstone peaches, skinned, pitted and blenderized into a peach pulp. I wouldn't pasteurize them, just add 2-3 pounds of peach pulp to the primary (or if you rack to a secondary, after you rack) after the primary fermentation has finished. That will keep your yeast focused on your malt sugars initially and then they can have the supplemental feeding from the peach sugars.
For yeast, a nice Belgian style trappist yeast would do fine, or an English ale yeast allowed to ferment on the warm side (say 70 degrees f.). These will produce a lot of fruity esters that will compliment this beer.