Odoo Modules v8 to v11

Hello! We are an ecommerce business moving our accounting system to Odoo Community but since the new version available is v11 we wanted to know if you can migrate the Odoo modules we found for v8 to the latest one. The modules have to move from Python 2 to Python [login to view URL] project would consist of 35 small modules, some are really tiny and others are a bit bigger, you can find them at the following link: [login to view URL] We have already 27 modules done from someone esle but we need to check if they are actually working and finish the other 8. We attached a file with the information on what happened to the various modules when we tried to install them. We need the work to be done with extreme accuracy as it manages our accounting, and we also require an invoice to be issued.