Since you are in the US, if there is a convenient Walmart I encourage you to purchase a relion prime BG meter, lancet, and test strips (these are the least expensive, easily accessible test strips I have found in the US). Last time I saw my doctor, we compared my relion BG reading against the meter he uses - they were within a couple of mg/dl of each other which is great.
As far as converting from mg/dl to mmol/l goes, you get used to it (I keep an online converter open on another tab in case I want to get precise).
There is a web site, blood sugar 101, that explains a lot about what is going on. I encourage you to spend some time reading there. In the 'how to lower your blood sugar' section, she describes testing BG just before a meal, then 1 and 2 hours after. By keeping a log of food eaten and BG test results, I was able to isolate (and eliminate) the foods that were causing my reactive hypos (and I do not miss them a bit). At first, while in a discovery/learning curve, if you can afford to test frequently I think it is good. As you get to know your body and how it reacts to various foods, testing frequency can go way down.
Because I am very small, in theory I should not need to eat more than 45 g/protein a day. But if I don't eat over 55g/protein, I get weak and feel terrible. So, I eat more. Most of my calories come from fat (whipping/double cream, butter, olive oil, lard, cream cheese, I make my own tallow...not many PUFAs, but that is me).