FOnzy if u have the room u may wanna move the elliptical somewhere u have more to look at.. I like watching tv while on mine

mental attitude for myself while doing cardio is huge.. If i was just staring at a wall the whole time id dread getting on it
As far as the rest goes im no expert in bf% guessing and if someone has a better guess knock urself out but i have a buddy thats similar in size to you.. His bf was 33%.. with u i would estimate maybe 35%.. itll work for the time being but like i said u need to get it dun..
280lb x .4536 = 127kg
127 x .35(%bf) = 44.45
127 - 44.45 = 82.55kg(LBM)
370 + (21.6 x 82.55) = 2153(BMR)
2153 x 1.55(workout 5 days/week) = 3337(TDEE)
Id guesstimate 2500 cals based on that to give u a decent deficit
40/40/20 is a standard split but thatd put u at 250g carbs/day .. Seems like too much IMO..
Id suggest u run 320g protein/180gcarbs/56g fat
Split ur protein between 6 meals split ur carbs between 3 meals add in some green veggies and total the macros to see where ur at with fat...
Thatd put u getn 53g protein per meal for 6 meals, 60g carbs for 3 meals , fats we can work out the remainder after we see where the protein gets u..
If i were u id drop all dairy(except lowfat cott cheese before bed) and all fruit and all bread..
Use only lean protein:chikn breast,tuna,eggwhites,lean (93% or less i use 96%fat free)ground beef,cottage cheese,
Carb wise id stick to what we know works

ats,sweet potatoes,brn rice.. Thats it...
Fitday.com is a good site to figure up ur macros u can plug in ur meals and itll tell u how many cals/pro/carb/fat per meal as well as a total and % for the day.. U can also put in ur own custom foods...
Once u get that dun post a diet and well take a look.. Read the stickies at the top of the page on cutting as well as tdee..