I am using a Nikon D7000. I want to use an SB700 on camera in TTL as well as have my Yongnuo RF-605N trigger my off-camera speedlights in manual. The RF-605N does NOT perform TTL pass-through. I see that there are some hotshoe cords with a hotshoe on both ends, but have heard reviews that claim that they do not fire both hotshoes simultaneously. I don't understand what sense that would make?? I am not opposed to using a flash bracket or having the trigger connected via cable if possible.
The SB700s have built-in wireless triggers for multiple flash-unit photography. I am assuming all your flashes are SB700/800/900 or compatible. You will not need the Yongnuo RF.
The master flash unit on your camera commands the remote units. The flash mode can be set on each flash unit.
If you have additional flashes that are not Nikon, you could use optical triggering for them.