Debug and Fix website problems

I have a website that has 4 issues at the moment. 1. When you select an Item and you save it, the data doesn't go through to the database. This has to be fixed. 2. When you edit an item you saved then that item doesn't update the data in the database. There's also sharing functionality that works but you have to make sure to implement the existing code in each of the items. This has to be fixed. 3. The search function has two issues. The first is that it gives an error message but still searches. The second is that once you select an Item you searched for and then cancel it it looks at an incorrect list of items. 4. Once you are logged in the website has to be in SSL. An SSL certificate has already been added onto the server but when I change http to https the website is all wrong. That's in a nutshell what has to change. Note this is a complex php website. Attached you will find some php files. The [login to view URL] is the "dashboard" when you are logged in. When you create an new entry it will use [login to view URL], [login to view URL],[login to view URL] and users.php. The onefile_update is when you update an item and the search php files is for searching. Please speak to me if you have any questions but please not that due to previous bad Freelancers I had the milestones will be set up as follow: MS1 - $20 - This is when I assign the project to you and you accept it MS2 - $45 - When point 1 is completed and tested MS3 - $45 - When point 2 is completed and tested MS4 - $45 - When point 3 is completed and tested MS5 - $45 - When point 4 is completed and tested MS6 - $20- NOTE: This is only if the project is completed in time and within scope. With the above Milestones I want you to give me a set date for each milestone. IF you do not deliver on that set date there will be a 20% penalty fee for each day which the milestone is late for delivery. I am looking to get this done as soon as possible I'm setting my MAX budget as $200 so please note that is my max I can pay for this job.