You can change the Work Effort Unit of Measure to FTE on many of the out of the box portelts/views in PPM from the List Options page that Abhisek sent a screenshot of. You can get to this page by clicking on the Options icon on the portlet/view, clicking on Configure, then this page is under the List Column Section tab dropdown Options link.
To see both capacity and demand, you would add availability (for capacity) and allocation (for demand) to the time scale on the portlet/views. The Resource Workloads portlet previously suggested would be good to view aggregate totals per resource. I also wanted to suggest the Weekly Detail portlet, which would display the data both per resource and per investment.
Hope this helps!