Summarized as follows

1) no need of hotel accommodation. Let him keep your ID copy, to show if some one ask..to tell accommodation shall be with brother

2) Need valid passport for more than six months validity

3) Need confirmed return ticket

4) Need to posess cash of more than QAR 5000 or valid international credit card.

5) Make sure passport has ECNR (Emmigration check not required) .. otherwise Indian Immigration will likely stop you. ...
ECNR is given for anybody who pass 10th standard... but need to submit the 10th standard marksheet while applying for passport. Other criteria also exists such as staying abroad for a long duration...