Project bike - Need help with wiring

General idea - Running headlight, handle bar switch, led brake light/turn signals, to a 12v or 48v rechargeable battery. The catch - the brake light needs to be activated when braking the brake lever. The LED is a clever design. Simple LED strip, with turn signals, red brake light function. I've built the mechanical side of the motor bike, but i have not a clue about the electrical side. What i do know, is that instead of using coils within the fly wheel, to charge the battery, i dont want to rob the motor from any power (nor pay 100 bucks for the new flywheel, coils, electric start) at least not till later. For now, i would like to use a rechargeable 12v or 48v. IM expecting the run time to be rather short, 4 - 6 hours ? Anyway, really just need the headligh, brake light, and turn signals to get it street legal.

Like i said, i have not the slightest clue on where to begin, but heres what i would like to use.

LED Strip w/ brake light, turn signals
https://www.amazon.com/dp/B01GJGCR9...olid=2F5T1WZXOVPYZ&psc=1&ref_=lv_ov_lig_dp_it
Headlight
https://www.amazon.com/dp/B01N8YCLX2/ref=psdc_9002297011_t1_B074K5JYVB
im thinking ill need this wiring harness
https://www.amazon.com/DZG-Universa...049112&sprefix=motorcycle+wiri,aps,153&sr=8-5
the battery
https://www.ebay.com/itm/12V-3000-2...hash=item56c34dba8e:m:m0e4tGb2xvnZll1f9byq42w
brake levers
https://www.amazon.com/Electric-Wux...HRNKTFCQGCN&psc=1&refRID=F8Q9E3YR0HRNKTFCQGCN

Thanks for any info you can provide.