Need to write APEX triggers and supporting unit tests

Hi. This project is for Salesforce. I need to some custom APEX code to do the following: a. When a new opportunity record type = ‘Banking’ is created, Add 3 Products: i. Banking Enrollment Fee ii. Mandatory Blood Screening iii. Yearly Banking Fee b. Create an Enrollment Agreement in PDF form with Account name and Timestamp of enrollment and attach the PDF to Notes & Attachments c. Email the Enrollment Agreement to Client with the transaction logged in the Salesforce I have already created the triggers and classes to do almost all of the above, but need some help writing the unit test to push to production. Thank u