I don't have an answer for your question, but wanted to welcome you and to say "Hi" and have fun riding. Let us know what you decide and how it works out.
I did have a 3 speed Electra Townie that may have had coaster breaks. It was a behemoth, terribly long and heavy. If that's the type of bike you're considering, I wouldn't consider trying to lift it. I think with some research there are better options for you. I ditto looking into folding bikes.
"Opportunity is missed by most people because it is dressed in overalls & looks like work" - Thomas Edison