My house ipa grain bill is
13lb Maris otter low colour (sub for US 2 row)
1/2 weyermann abbey malt (or aromatic)
1/4 caravienna
1/4 flaked barley.
If you want to simplify you can go 13lb base malt and 1/2 of caravienna or 3/4 pound abbey/aromatic
Mash low to get a nice fermentable wort.
A neutral yeast like us05 or Nottingham.
As for hops I normally do a bittering charge, warrior, magnum, horizon or northern brewer are good choices to get to 50 ibu's.
Then at 15 mins, whirlpool and later a dry hop. At least 3 Oz in the whirlpool and 3oz in the dryhop. Normally just an Oz at 15 mins.
I suggest simcoe and Amarillo in a 1:1 ratio at each step.
If you can afford more hops use more, I normally just use up the pack. So my stand and dry hop are about 1/2lb each.