Welcome to the forum! I had made a couple orders before I discovered the forum, then lurked around without an account for a week or two to read some about some topics I was interested in 
When I made an account, I spent a lot of time browsing around the threads before I started joining in the conversations 
Here are a couple threads with reviewing advice to help get you started: How to Write a Great Review, Reviewing Reviews, The Review Writing Routine 
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