I'm currently using an Arduino UNO (but may need to switch to a MEGA due to memory issues) to control about 20 strands of WS2811 RGB LED Strings([see similar product here](http://www.ebay.com/itm/12mm-WS2811-IC-Green-Wire-IP68-RGB-Digital-Led-pixel-Module-String-DC5V-Input-/161867970269?var=&hash=item25b01536dd)). I'm Using the FastLED library to send all of the data at once through a central data line. My questions are in regards to properly and safely injecting power. 

I'm more of a programmer than an EE, I've done similar before but it has been years. For my safety I have a few questions:

1. When injecting power do I want to splice the positive and negative in so that the end of one strand is connected to both the new 5v line and the next strand(is this series with injection?)? or do I want to cap off the first strand and simply run the 5v from the power supply to the next strand(straight parallel correct?)?
2. What effect will the series vs parallel from the last question have on Amps?
3. I'm using a 5v 60 amp power supply. It has multiple positive & negative terminals. Does it matter if I run all of the injection wires off one positive and one negative terminal? or should I split them evenly across terminals?
4. The previous question probably effects the setup of my fuses? If I split the injection wires into 4 channels, should I then use four 15 amp fuses?
5. Am I missing any important safety factors?
6. I remember finding a simple (for kids) browser app that let you place nodes than showed the difference between voltage and amps. Does anyone have a link to this?

Sorry for all the questions at once, especially since I'm sure they've been asked before. Since this will be going on our Christmas tree, I'd like to be thorough.