I would not use any HTD5M sprocket less than 15 teeth. You can make the motor pulley bigger if you need a lower gear ratio or use a lower kv motor – like the 140kv Racerstar
We talkin about chains 
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You can get a Flipsky VESC 4.12 for $50 on AliExpress right now, link below. Also if your planning on making a battery, how do you plan to assemble it? Your gonna need a spot welder and nickel strip most likely. Also make sure you use the correct battery chemistry BMS and charger.
For your first build I would ether recomme you to get a lipo or a cheap li ion battery (if it’s within your budget) 
@pat.speed - wow, this setup made me reconsider everything i had planned. I like the idea of sprocket insted of belt, and keda motor is amazing for that price. @JdogAwesome - i saw that VESC but im a bit sceptical, thats why i wanted to go for Maytech one. I’ll risk it with this one, and will limmit the current to cca 30A. Will run it in current no reverse with brakes, i read that FOC is a no go on cheap VESC copies. @Mich21050 - the battery is not a problem since i have spot welders and lasers, and coworkers that have experience with this. Will go for 8S2/3P pack maaaybe 10S.
I failed with the charges and BMS, because i apparently dont know how to read. Will get this charger: AliExpesss and still deciding between BMSes, either this BMS or this BMS.
Also i cant decide between this setup: Motor: 1650W,5065 Racerstar sensored 200KV - 40$ Generic Aiexpress mounts, puleys and belt (3M) gear ratio 3 - 20$ Complete board on Aliexpress for 40$
OR
HK Keda motor 6364 190kv 2000W - 50$
HK mount -10$
HK trucks - 35$
Aliexpress wheels 25$
Sprocket kit - 15$
Only thing missing here is the deck, which i can make my own or try find under 40$ deck from somewhere.
The difference is 40$ plus deck, but the parts are better quality and motor is stronger (but sensorless 
)
The more i read the less idea i have on what im gona buy.
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I mean I both the Maytech VESC and Flipsky VESC and they both seem to be very similar, but it’s up to you 
i would get HK trucks, mount, pulleys, belt, vesc, KEDA 6364 (i had it and i liked it)
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I’d say the biggest mistake here is to go cheap on the board/trucks/wheels… There is absolutely no reason to buy poor quality new shit when there are so many second hand longboards around. The board / trucks combo is essentially what will define the quality of your ride, and what will take the abuse. Get some proven combo, and build from there. For the same amount of money, you’ll get quality used gear that would still outlast any new cheap stuff by a couple of lifetimes.
A shitty board with a good drive train is still gonna feel shit no matter what you do.
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I would definitely take the second option. The first is less powerful and the belt will not stop skipping under acceleration (trust me I bought it trying to be cheap). For $40 more you can get a very reasonable budget board that is a great way to get you into esk8. The other great part is it can be upgraded relatively easily.
As for battery go 10s2p it will have more torque, top speed and won’t need to put out as much current to get the same watts