I find I usually follow the below step... You can modify of course. I don't think you will find any real YouTube tutorials to building a PC, it's alot of personal preference and you own experiences. You will probably do and redo several items before you get what you want. And I never use a grounding strap. Just don't wear a sweater and fuzzy slippers on a shag carpet. Just touch something grounded before you begin to release any built up positive charge and you will be fine. Just don't get frustrated, that will end badly. Walk away for a while, and come back if you have a temper. The only time I have ever broken anything is when I got bent out of shape. And you will need ZIPPY TIES.. they are a builders best friend. I have every color available at HomeDepot. Walmart has a little assorted can as well. I found it near the car stereo stuff.
1. Install your CPU, cooler, and Ram onto the motherboard before you install it into the case. It makes life easier. If you have a non OEM CPU cooler you will need Thermal paste. Just make sure its of good quality and follow the directions to apply. You can find entire threads of how people THINK you should apply it, but there are a few effective ways.
2. Give your case a good inspection. No loose wires, screws, etc.
3. Install your Power supply...because sometime you can't get it in there after your CPU and mobo are installed. Not saying ALL cases, but some.
4. Install the standoff screws for your mobo, check the holes on your mobo and make sure you get them in the right holes in the case. Then install the mobo I/O
plate in to the case. Install the motherboard into the case.
5. Install any case fans. (plug them in later)
6. Install your Drives (but not the cables)
7. Run all of your power wires. If you have a modular PSU it makes things easy. If not, figure out what you need and lay then aside. Bundle your unused wires and zip tie then in a neat location out of the way. I find the spare 5.25" bays work well. Run your wires neatly and zip tie then in place. You don't want a rats nest of wire, it kills your airflow. Remember to leave any PCI-E cables you will need for your video card.
8. Install the I/O cables, SATA or IDE. Make sure they are neat.
9. Install your video card and any other expansion cards. Make sure to keep the power wires need for your video cards.
10. Just look over everything. Make sure everything is tied down, plugged in, etc.
11. Plug it in and FIRE IT UP! I always leave the side off, it helps you hear anything that might go wrong. Sometimes you get a loud fan, hard drive, wire hitting a fan, vibrating fan or case panel. It's just to keep an eye on things. I usually put the side on after a few hours.