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Divide option is not meant for meshing in ETABS. It is to "divide" an already drawn panel after one has changed his/her mind regarding the assignments of that element. Having said that, you can use it for meshing as well. But, it will become very cumbersome and lengthy when you want to change some assignments in divided slab elements, as you will then have to select those small panels by zooming on screen. Use meshing option to mesh the area elements. Meshing can be viewed by activating the "Shell Analysis Mesh" option from "Set View Options" tab.

Consult PCA notes on ACI 318; chapter 10 of PAC Notes on ACI 318-08. It is better to check them in software by considering the creep and shrinkage as well as excluding the deflections occurring before the installation of partitions.

It has been shifted here as attached. Path to get to that is: Define > Load cases > Add New Case

The attached information is related to design of steel structure (portal frames). This is is not related to your design. For shear wall based structures, it does not matter whether you assign fixed or pin support. Only soil-structure interaction (SSI) will change your results. The simplest way to model SSI is to use Winkler springs under the foundation. For that, you will have to model footing with shell elements and assign springs based on modulus of subgrade reaction to the bottom and side faces of foundation. If you have below grade stories, you can assign springs to your basement walls as well. The detail discussion on the subject can be accessed through these documents NIST GCR 12-917-21 Soil-Structure Interaction for Building Structures FEMA P-2091 A Practical Guide to Soil-Structure Interaction