Wow, nice little video editing setup you have there. Sysinfo (Aminet) will tell you that you have 2mb memory on that Picasso - even if you only have 1mb. The way to truly tell is by physically looking at the ram chips on the board. If there are 8, you've got 1mb, 16 dram chips would be 2mb.
The bottom VGA port on the Picasso card is an Amiga video passthrough. You do not use this, unless you have a VGA monitor that can sync down to 15khz. Good luck with that one.
16mb is the max for that combo card and just fine for most Amiga apps.
DPS/PAR as well as many other hardware manuals & software here:
http://amiga.resource.cxDeneb is a cool card you may want to look into. Can get on the net with it via USB ethernet as well as all the various USB devices. X-Surf is another (and cheaper) option. It has IDE ports and A1200 clock ports on it as well.
Should not have any problems with OS3.5 and your GVP card. If you get an 040 or 060 card someday, you'll quickly learn what a 68040/68060.library is though ;-)
LMK if you ever want to sell that Emplant card...