One other related question do I need to add all of the "left over" electricity together from all the pins to sink it or is it still as long as each individual pin isn't sending back more then the board can sink I am ok?
That gave me a chuckle on this dreary day. Remember that question, and in a few months ask yourself the same question. If you have a laugh, congrats, you are getting to understand it.
There is no "left over" electricity, or if you were referring to Voltage, there is again none left over. The components you use have a voltage specification, and it is your job to ensure the supply falls within those parameters. There are some components you might use as a beginner that won't, and you must add additional components to deal with it. Led's are the big one, with required voltages of only 1.5V to 3.5V (forward voltage or Vf). Resistors are placed in series and sized in accordance with the total voltage (in your case 5V) and then to limit the current (If-or forward current). This must also be checked against the limitations of the supply, which in your case is 5V and "X" mA. I put "X" because the specs for the arduino call out 40mA max, but it is normally kept down to 20mA or so. If you only want 10mA through the led, great, it is UNDER the max current, but the pin supplies 5V regardless of how much current it is sourcing, provided it is under the max current.
For now, you would be good to just concentrate on current usage. Yes, make sure the voltage is the right for the component you are using, but current is what gets newcomers in trouble. The limits on the supply-whether it is a wallwort, battery, arduino I/O pin, arduino 5V regulator- they all have a max current. Stay BELOW this limit, I like to stay 50-75% of that limit. Just add up all the current each device uses to get the current required of the supply. If you have 5 led's set at 20mA each, that is 100mA, or .1Amp.
This is what is considered CV, or constant voltage supplies. The current is variable and will match the requirements of the circuit EXACTLY. If you had a 5V 10A supply, and using the led example above used a ammeter to measure the current, you would only read 140ish mA (arduino uses some too), not the 10A the supply says. Throw in another 5 led's and that reading would only be 250mA. Hook up 1000 leds, and then something odd will happen. The current will be maxed out at 10ish amps, but the voltage will have dropped to something much less than 5V. The led's probably wouldn't light up and the supply would probably start getting hot and stinking. That is because those 1000 leds are trying to sink 20A, but the supply cannot supply that much. The supply sees this as a short circuit, so max current flows and voltage drops. This is what you want to avoid.
There are also CC, or constant current supplies. They are used a lot for high power leds (learn why later). The CC supply will have a constant current and the voltage will actually vary to match the need, just like the CV supply varied the current.