Pricing of Azure Web Service with Azure SQL

Hi Team

I am New to using Azure App Service and Azure SQL Database, I have created a Web App which will use SQL database would I like to host in Azure App service using Azure SQL database as database. It is like E-commerce website where 100 of people will browse every day. I am not sure what Subscription plan I need to choose which would be cheap and best. I have tired this question with sales but no proper responses. Can you guys kindly help me. I got some suggestion like server less will less cost. Can you guys kindly advices me.