EngrJunaid,
What you are doing is not enough. You need to make sure your walls are designed for axial load + out of plane bending & in-plane shear + bending. Also design requirements for roof diaphragms should be incorporated and serviceability limit states should be checked..
I would recommend you to get a good reference book at-least. I personally use Masonry Structures: Behaviour and Design There is so much in masonry that would be new to you. Like Mortar Types, Concepts about 1) Vertical and horizontal load transfer, 2) Distribution of Shear and Moment due to Lateral Load, 3) Torsional Effects etc. and most importantly 4) Masonry Shear Walls. If you know how to design one, you can save your client a lot in Pakistan since no one is focusing on building low-rise (up to 10 stories) masonry buildings.
Thanks.