Urgent

I under took an accounting work of a works contractor they are doing  Interior Designing work of a hotel , It is a proprietary concern, my query is

• Method of accouting we should applied for  (Contract Accounting or Normal accounting)
• Book of accounts in which we have to maintained
• what step to be taken for doing this job
• which area we have to take more reasonable care
• If we shold consider the Work in progress ( WIP) , WIP Reserve , Work certified and uncertified

Can any body Please replay immedietly, it is urgent

Thanks in advance