Changes and customization on a Joomla website

Need an experience Joomla developer who can make the process on my Joomla website like the reference website. Need to fix the My Account login and register process like the reference website. Need a checkout process in stages like the reference website. Need user authentication on site load like reference website, which will not use the Joomla registered user account but one account for all users and he will to get register or use his login credentials for checkout process later after entering the site. Need all the functioanlity use on the reference website. Reference website: [login to view URL] username: cici password: funfun My website URL: [login to view URL] More details will be shared with a selected freelancer