Advice for hiring in Bangladesh

I am in the process of having to set up a support team for my business in South East Asia, and Bangladesh will be one of our first-launching markets. While I will visit shortly, I want to get a head start on understanding the business and hiring environment, especially in Dhaka.

Does anyone have any advice to share in terms of:
- What to expect when interviewing candidates in Bangladesh? (Do's and don'ts?)
- What is the language proficiency of professionals in the area?
- From my research it looks like there's a big customer service (call centre outsourcing) industry in Dhaka, but has anyone had any experience dealing with local business support teams? (I'm assuming it's more common to ask for service face-to-face or over a phone call?)

Any advice would be appreciated!