help with joomla4 installation

Job ID: 33751922

Budget: $10 – $30 USD

I was hacked in December and hadn´t been able to install by myself joomla 4, with Gantry 5 and rockettheme templates. Messages such as
Error
Property 'mime_type' of argument 'item' of event onFetchMediaItems has a wrong item. Valid: string in media folder or
Warning The PHP temporary folder is not set.

This folder is the folder that PHP uses to store an uploaded file before Joomla can access this file. Whilst the folder not being set isn't always a problem, if you are having issues with manifest files not being detected or uploaded files not being detected, setting this in your php.ini file might fix the issue.
Forbidden

You don't have permission to access this resource.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request. when trying to modify template.
I have always been able to use back end, and its easy for me to uptade my website. But know very little in regards to php and other more technical aspects.
I wish also to insert new plugins such as calendar , ecommerce, and some kind of "firewall" to prevent form further attacks.
However at this moment I just need to have it ready to work, In three months haven´t been able to find a reliable joomla adviser.
Related categories: PHP Joomla CSS MySQL HTML