How to wire two relays

This is my first post, but I've been reading a lot and have learned quite a bit. 

I want to install a roof monitor, dvd player, fm modulater, 400W inverter and wireless headphones.

I want to wire direct from the battery and use two relays, one for the video system, the other for the inverter.

Now , my question is how do I wire the two relays? Do I have to wire them together off of the power wire and if so how or do I connect them separately?

Thanks in advance  

Sure, you can use a single switch to turn on 2 relays for seperate sources.

PIN 87- Fused constant source 12 volts

Make 2 relays like above with 2 seperate fuses and merge the 85's to a single switch