Any tips for writing my resume? Sales in a tech retailer

I don't have any experience, and I'm not sure what I should write, how much should I write.. It's a lot easier to do it in person, but I need to send an attractive resume first.. How do I start? Any important bullet points?
I really suck at these type of things..
 
Should I include my hobbies? My past at FRC (robotics competition for highschoolers)? Volunteering at a school as a math teacher? The fact that I go to tech forums like this one?
FRC is the most teamwork intesive thing I ever did, and volunteering as a teacher might show that I'm good with people, I don't know.

Should I mention I visit the site pcpartpicker very often? forums? r/pcmasterrace ? Tech news sites? ANADNTECH? do they matter?

Also, how do I tell them about my skills and knowledge without making it sound cocky and showoff?
 
Here is a quick (and bad) translation of my resume (alpha) to english
I hope I won't screw it up..
I will format it as PDF..
I'm trying to balance it..
 
 
Name: Eyal ***
ID: *******
email address: ******@gmail.com
phone: *******
position: sales
location: *****, ****, or *****
 
Hello, My name is Eyal ****. *** highschool graduate . I would like to work in KSP sales role. I have knowledge in technology (the kind of person you can talk to for hours about many fields in technology, gaming, computers, and some comic books). I Like to help and give advices to people at technology in general and computers in particular. I'm also a regular customer, the last 4 computers I bought was in KSP. I participated in the project FRC (Robotics Competition Teams high school students, very intense and fun), I volunteered at the Democratic School *** at *** city as a math teacher. I regularly help people choose what to buy (CPU, video card, how much memory ..) and convincing people to buy a gaming PC instead of consoles, even people I know personally and to strangers online. I used to visit many sites in the fields of computers, smartphones and Technology .. sites like: anandtech, arstechnica, techpowerup, pcpartpicker, overclock3d, teksyndicate, linustechtips, GPUboss.
 
Thank you for your consideration.

Talk about what you have done and what do have learned. Organize it by time. I wouldn't metion website managers and human resources don't care about that. Also get references teachers, business owners/managers all help, 

Thanks.

dont work in retail dude, you're better than that.

He is in high school nothing wrong with getting a starter Job.

Thanks, but that's something I really want to do.. I enjoy helping people choose the right parts for their systems, make the right choices.. And I think I fit this type of job.. Besides, I don't have any experience in this field (I was a volunteering math teacher until recently).

Yes, previously I was teaching math, but I want to get into the industry, and I love helping people choose the right parts for their PCs.. Interacting with consumers sounds like something I would enjoy..

Besides, it's not a BestBuy style store.. This store focuses primaraly on PC hardware and accessories, phones and tablets.. But this isn't the type of store that would tell the sales people to promote xbone or beats.. The people who work there are PC enthusiasts, most of them are gamers..

I sent the resume.. wish me luck..

Good Luck!

Thanks!