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Tl;dr Learn to think with UE4 blueprints, learn to code in Unity, move into C++ in UE4 to become a rockstar. That depends. If you want to build a short game, about 3 - 6 months. If you want to build a large scale video game, 1 - 2 years.

Blueprints is just a language just like C++, it's also well documented and easily accessible than C++. If you choose to develop with C++, you're going to have a hard time because the documentation is very vague and learning material is scarce.

Create an actor or component when appropriate. Find functions in C++ and determine which types map to what in Blueprint. Bind C++ functions to user input levels and delegates. Create uproperty variables for different levels of access for the editor and Blueprint.

No it doesn't depend, no it's not a matter of your personal choice. Blueprints are meant for prototyping and for simple scenarios. In most heavy games you will need to use a mix of two, largely C++. Blueprints can be 10 times slower than C++ and in larger games they can get very complex and difficult to manage.

Your Blueprint Project is now a C++ Project.You shouldn't have to open Visual Studio ever again unless you do some C++ code, but you still have to keep Visual Studio installed.

Blueprint people obviously can learn proper programming, but blueprints are so easy to use, so many people love to script things "any way it just works". "Any way" is often a terrible way.Learning any regular programming language helps a lot to learn how to efficiently use blueprints.

Blueprints is the visual scripting system inside Unreal Engine 4 and is a fast way to start prototyping your game. Instead of having to write code line by line, you do everything visually: drag and drop nodes, set their properties in a UI, and drag wires to connect.