i don't know how far you get so ill do this as if i was putting a repaint in.
hope im not telling you how to suck eggs
Any way first off when you convert you b-52 files to dds or bmp make sure the files that have L(R) at the end of them make sure you to change them for example B52_7L(R)_T should be changed to B52_7L_T and B52_7R_T
next after you have converted you files put them in a folder starting with texture.and what the B52 title will be EG texture.USAF bat out of hell

then open you main b52 aircraft folder and open a texture folder all ready there and copy the texture cfg out of this folder in to your repaint folder

then drop you repaint in to the main B-52 folder and then scroll down and open the aircraft cfg in note pad but make sure the always open with box dose not have a tick in the box

then u should see some thing like this example at the very top

[fltsim.0]   (you will need to change this number to the next one in line)
title=CS B-52 BUFF Exterior Paint0 (you will need to change this 0)
sim=b520
model=
panel=
sound=
texture=600050 Dragon's Inferno ( name of your repaint folder here)
kb_checklists=
kb_reference=
atc_id=600050 (edit this)
atc_airline=USAF
atc_flight_number=0050 (edit this)
atc_heavy=1
ui_manufacturer=Boeing
ui_type=B-52
ui_variation=USAF 600050 Dragon's Inferno (edit this)
ui_typerole=Strategic Bomber
ui_createdby=Captain Sim
description=B-52 BUFF Exterior Pack v1.0\n(c) 2010 Captain Sim www.captainsim.com\ repaint by nath 2889.( add your name here)

make a new one of the example above at the end of all the bombers you have also change the parts were i have commented in ()
and if you have 3 B-52

then the this line  
[fltsim.X]

should look like this
[fltsim.4]

And this line
title=CS B-52 BUFF Exterior Paintx


should look like this
title=CS B-52 BUFF Exterior Paint4

thats it save the cfg then you should be able to find you B-52 it wont have a thumb pic until you make one for it
hope this helped