I want to know the steps to remain fully anonymous throughout the entire process. I know the most anonymous way to buy bitcoins would be through localbitcoins but I don't want to do that. Is there any other way I can anonymously buy bitcoins?
After I buy the bitcoins how should I go about tumbling them? Should I use a bitcoin laundry? Also, I don't really know how bitcoins work so do I need a bitcoin wallet or how would I go about getting them into my BMR account?
I would only be buying small quantities of products.
My whole goal is to stay anonymous throughout this entire process.
Am I being to paranoid and should just go with coinbase and just add it to BMR from there?
No you are not being too paranoid, you just need to chill enough to think clearly and logically. You need to do a lot of homework but I will give you some advice.
You could use coinbase if you wanted, but tumbling is a necesity. Use
Bitcoinfog: http://fogcore5n3ov3tui.onion
Make sure you are using the latest version of tor with scripts disabled (do you see an S with a red ghostbusters-symbol type thing? That means it's disabled.
Do you know how to use PGP? That is one of your greatest tools for staying anonymous. Never send your address through a Darknet site without encrypting it first.
Also, only ordering domestic will put your mind at ease. No customs. And don't FE (finalize early). That's the gist of it. Just relax a little and do some more research and you should be fine. Always remember that there will be risks and don't get cocky.