Can you please let me know how to generate the Facebook ads for my ecommerce website, reach the target audience, and convert the customers to my business?
You will need to have a FaceBook presence and open a Facebook Ads account. The steps vary according to your audience and product. The specifics are available in your FB Ads account.
Trial and error is a mean teacher so it is helpful when people offer tips on the pitfalls and secrets gained from experience - the ins and outs. Just remember, in forums you are asking your direct competitors for advice.
If you need to get it moving fast, there are agencies with experience that can help for a price. If you have no experience at all, it is one way to learn.