You do not need secondary, almost never. In over 50 batches, I never racked to secondary, nor would have been useful for me.
I do not know about the " peach " part in your IPA, but a simple grain bill, will always help keep the beer focused. Something like 100% Pale Malt/2-row/Golden Promise/Pilsner/Vienna. If you are a fan of Crystal malts in IPAs, you could use 5% of it.
If you are adding fruit to the beer, note that fruit are acidic, meaning they will drive the pH of the beer down, making for a more tart/crisp end result. Take that into consideration when you adjust your mash pH and post boil pH. The yeast you will be using will also determine where the final pH will end up.
If you are adding fruit, a bolder malt presence could aid the overall body of the beer. Maybe something like this:
50% 2-row + 50% Vienna
40 IBUs
5-6% ABV
Yeast: US-05/S-04/BRY-97 or liquid yeast, such as any Conan derived, WY1318, WLP001, maybe an english yeast to retain some residual sweetness to counteract the acidity from fruit.
Hops: Anything fruity, citrus forward, dank, resiny/piney would work. Citra + Mosaic + Simcoe or anything similar would work fine. You can also opt for Australian and New Zealand hops: Riwaka, Galaxy, Topaz, Ella, Vic Secret, Enigma, Wai-Iti, Wakatu, Rakau, Kohatu, etc.