I'm developing a website for a courier service, that has service quotation filling at the front end. 
I did all form things working, a quotation will output variable with the cost of service in PHP.
After filling the form there will be checkout button, with that checkout button i need to save the details of the user, and that price to the woo commerce page to check-out/or fill further details.
 I searched throughout the google and got 1 solution to create a product with these values in front end. But its became very difficult to figuring out signing in, saving values, keep details in specific formate etc... for me as a beginner in PHP.
Can anyone help me with this?.
i just need woo commerce to make checkout with user entered details in the form.... 
. 
EDIT & Updated :
Thanks for reply  LoicTheAztec, I have gone through quick toure now
About code : I'm sending the values calculated in form to the page called buy-now using URL using javascript window.location.href=.
like http://example.com/buy-now?price=120&weight=80&location=000001
And also I'm able to fetch the value using 
if (isset($wp_query->query_vars['pricef']))
 in page template. (with StackOverflow help) and I'm checking user is logged in? using if(!is_user_logged_in()) 
and showing login form, After login also i can get the variables.
Now I need to create a transaction using this. 
Saving data like a product or post and proceed for payment, I don't need to use woocommerce to do this but need some sort of idea to make it work. 
 Thank you.
