Cwa + ca articles

HI everyone out there
I have cleared my ca-ipcc exam (nov. 2011 attempt ) and now i have joined articles 
IAm also planning to do icwai along with my articles 
i just need ur advice (abt. pros and cons on the same ) and how much (minimum) time do i need to finish icwai and will ther be any issues arising out of it (like problem with icai institute or icwai institute ) and do i need to go for oral/postal coaching 
i dint quiet understand what do they mean by "Coaching Clearance" before being eligible for examination 
please do advice me ........
[ im not a graduate]