Digital ocean wordpress setup and fix few installations

Budget is 20$,need to start [login to view URL] should not take more than 1-2 hrs for experts,please apply only if you have previous expereince with UBUNTU VPS(digital ocean) and wordpress setup [login to view URL] have atleast 5 years of experience. This is a droplet in Digital Ocean which is already running on Ubuntu 16.x wordpress but have few issues as mentioned below: This is on hhvm and nginx. 1)Need to fix http error while uploading files to media,not able to upload larger size images/files to server. 2)Need to fix send mails from server ,wordpress is not sending any mail,need to configure accordingly. 3)Need to fix issues,why server is stopping ,need to run 24X7,have to restart nginx and hhvm and it works again. 4)Need to setup subdomain(staging environment),bitbucket and replicate the code from live to staging and make sure it works like a charm as production. 5)Need to setup auto capistrano deployment for staging and production . 6)Improve caching techniques and make site load faster.(setup redis for wordpress) 7)You have to work on teamviewer sharing your screen. 8)Setup emails with domain name,can use third party clients ,free.