1) As long as the SSD and HDD are SATA interface, yes. And almost all are today. Just be sure to opt for SATA III for the SSD.
2) System memory is limited to 2 x 1.5V DDR3 DIMM sockets supporting up to 16 GB of system memory. You can find all the details at the MB's website here: http://www.gigabyte.com/products/product-page.aspx?pid=3917&dl=1#sp
(Verify that I linked you to the correct version revision for that board (1.0). If yours is a later Rev., you will have to search it out.)