edit and update wordpress

my current website is [login to view URL] after updating all the plugins at once i receive this message "There has been a critical error on your website. Please check your site admin email inbox for instructions. Learn more about debugging in WordPress." I will like for a professional developer/designer to put the magic touch on my website which was created in 2016. The person that originally created this website was from india. they did not do the website to my full satisfaction and i wish i had stayed on freelancer to complete the project. anyhow i paid them so that i can move forward with someone who knows there stuff. i will like for a professional to come clean up and edit the site to make sure the design and functionality is up to date and has a good flow. I tend to add a feature and here are the details Customers will use this website to order Plantation Shutters, blinds and custom drapes. The Plantation Shutters page will have pictures of current shutter projects and examples of configurations for the Panel operation. Customers will be able to enter size or dimension (width x height) and price will be determined by shutter type (standard/bypass) and (Real wood vs. PolySatin). Customers will be able to label room and window location as well as select frame type and whether or not they will like to order a decorative sill cover. After the customer customizes the order, they will choose calculate/Get estimate. This will show them the cost of shutters. Next Step will be to approve the estimate and place order, at this step the customer will provide name, phone number, address, email address and place order. When place order is submitted, information will be forward to customer service along with an order number. An agent will contact customers with a date and time to verify measurements. When a technician goes to a customer. He will pull up order through the application and verify customer measurements and be able to after order if necessary. Cost to confirm measurements will be $80-$175 and will be included in total prime at time at processing order. Customers shall be able to track the process of order because they will be updated whenever their order is updated. The design of the website shall be simple and easy to navigate. The color scheme shall be gray, blue, white, yellow. All orders placed on this site shall include measure an installation. Standard orders shall take 2-4 weeks from time of order to, install on all american made products. Orders from overseas may take up to 6 weeks. All orders are custom made and cut to size cancellations are to be within 72 hours or 3 days you may cancel your order but there are no refunds on cut materials.