How to obtain citizenship of New Zealand?

I want to migrate to New Zeland. I have a recognised BBA degree, studies and stayed my entire life in Bangladesh. Age 26, Sex Male, Status married. Working for a British company for nearly 4 years at executive level.

You cannot become a citizen of New Zealand until you have obtained a resident's permit and been a resident of NZ for 5 years or more. To find out if you qualify to become a resident, which will allow you to live and work in New Zealand, you should visit the New Zealand Immigration website. It is very comprehensive and will show you clearly the various ways you can live and work in New Zealand with a view to becoming a citizen. The site also has many good links to other sites which will help you further. Through the site you can complete a 'self test' to see if you are likely to qualify. If you believe you do, then you can complete an expression of interest with a view to being invited to submit a full application.

The information you have given about yourself in your question indicates you may well be a good candidate. You and your family will have to show that you are medically fit and have no criminal record. New Zealand has some urgent skills shortages (the website details what these are) and it will be a major plus in your favour if your qualification is in one of those areas or if you can line up a job offer as part of your application.

The immigration website is given below as well as a respected NZ job site.

If you have the money, go and further your studies in New Zealand as a full-time student. Get a job. Apply for citizenship.