Hello Jain,
As you have mentioned, HTML is ready for the page where you want to implement paypal checkout.
This task can be completed in an hour. I will create a paypal button and add that to your html. For setting up paypal button I need few information like business email, amount you want to charge, return URL, cancel URL, whether its one time payment or recurring.
I am available now. If you say I will work for you on this task.
Do not pay me unless and untill fully satisfied.
Waiting for your response.
Thank you.
Nirmal