If I have one power source coming in, do I just pigtail the black wire to the two swtches and wire nut the white wires together? Also do I pigtail the ground to the switchor just wire them all together?I am running 12-2 wire. And controlling two different light sources.
Also on 15amp breaker, how many 60watt bulbs is a good practice to run off it. And along that same lines, how many plug ins can you run with a 20amp breaker.. all 12-2 wire

Sorry, missed your question and let it go by. My answers are in bold.

If I have one power source coming in, do I just pigtail the black wire to the two swtches and wire nut the white wires together?

Yes

Also do I pigtail the ground to the switchor just wire them all together?
Yes


Also on 15amp breaker, how many 60watt bulbs is a good practice to run off it.

24

And along that same lines, how many plug ins can you run with a 20amp breaker.. all 12-2 wire

10

I have one line, on it from the source I have two lights to a double switch and another light to the other part of the switch. (the switch has two switches on one unit). How do I wire this properly?