To repeat, if you're in India, why buy something that's made in China, shipped to the USA and pay to have it shipped back across the ocean? Not to mention you have to pay the vendor the profit he needs so he can stay in business? Find a local importer or buy direct from China.
I've had mixed results buying small things off aliexpress. Simple parts are inexpensive, take a while to ship, but are generally good, and shipping not expensive. Sometimes, the electronics don't work as expected, and then I am stuck. For example, I bought a small 350W controller that didn't have a useable pedal assist. I read the ad wrong. Great for throttle, and cheap at $43 USD shipped with an LCD. I threw it away, kept the LCD, and bought a $21 model with pedal assist. So stay away from aliexpress ubless you know exactly what you want.
I would look at kits from elifebike.com and BMSbattery.com. I have bought motors/controllers from both and they work fine. Another vendor, said to be reputable, but I have no experience is em3ev.com. Owner is English, lives in China, and can answer your questions. A 36 volt 350W motor kit will let you ride 20 miles easily.
You don't solder or use tools or know how an ebike is put together? Then you might have to go with a full turnkey kit. Chinese kits have no instructions. They expect you to be experienced. . E-bikes are not trivial, but they require electrical knowledge and bicycle expertise.