I work for a company that specialises in producing accounts for small and large companies. accounts are produced for the brewery industry...is it ok for me to work there??

I work for a company that specialises in producing accounts for small and large companies. I have been recently transferred to another accounts department. In this department, accounts are produced for the brewery industry (mainstream industry to sell alcohol). We produce management accounts for each public house that the brewery has. Although each public house does not directly benefit from the services we provide, as we only take the information provided to us and place it in a format that accountants can understand. There is great benefit for me to remain in this department as I am gaining good knowledge. 1) I would like to know if I am allowed to work in such a department. 2) I would also like to know if one is allowed to perform namaaz of Istikhaarah in the masjid, after Isha and is it better to perform in the masjid than in ones house.