http://web.bizbangladesh.com/website_hosting_bangladesh.html

Never had a downtime with them and their support is very fast to response and they are all very helpful.
References :

Then installit to your web hosting account.

To choose a poper web host, as an experienced webmaster I recommend BlueHost service which I’m sure it would work for you and fulfill all your requirements. They have a really great offer for hosting & I have used them for over 3 yrs now, and have never had a single problem with them.

You can reach reviews about this web hosting provider and its latest DISCOUNT COUPONS at:

http://www.threehosts.com/reviews/1st

******IMPORTANT*******
* This service was awarded “The Best Web Host OF The Year”.
* If you sign up for this service you will have $75 credits to advertise your website with the google & yahoo search engines for free!
* You Can Register A Free Domain or Use Your Existing Domains. They Support All Domain Names.
**************************

Another useful link:
http://www.threehosts.com/create
There you can find a step-by-step guide to start your website.

Good Luck!
References :
http://www.threehosts.com

I recommend you to check SkaDate community software at http://www.SkaDate.com. It is a turn-key solution for creating a professional social networking site.

The software costs $350, which is a one-time fee. SkaDate team will install it to your server, and you will get an up and running site with such features as photo and video sharing, albums, groups, events system, forum, blogs in no time. The default software package includes access to the source code, free templates ( http://www.SkaDate.com/site_samples.php ), access to the customer support forum, free lifetime access to all version updates and upgrades.

Important – a hosting company has to be chosen in accordance with the selected software system requirements. Here is a list of the hosting companies perfectly suitable for SkaDate software: http://www.SkaDate.com/hosting.php

To start an online community site a shared hosting plan with about 400-500 MB disk space and 20 GB bandwidth will be more than enough. Eventually, as your members database gets bigger, you will need switch to a larger plan. And if you need better performance at higher traffic load – you will be able to move your site to a dedicated server.
References :
http://www.SkaDate.com