How to get rospack, roslaunch, etc. to work in Windows 10 (Melodic)

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I have installed ROS for Windows 10 per the instructions at the link below: http://wiki.ros.org/Installation/Windows

I am having trouble figuring out where to place my workspace and packages such that they are able to use standard ROS commands. roscd brings me to C:\opt\ros\melodic\x64

I created a workspace in that directory, but none of the packages inside are recognized. I am able to start roscore and then manually start nodes with "python myfile.py", but I can't run launch files without going into the directory with the launch file and I can't use roscd package_name to jump to a package, nor use rospack package_name to find a package I create. Using the list parameter I can see the packages in the share subdirectory (of x64), but not my packages.

Are there any additional steps I need to make these commends work, or a special directory I need to put my workspace in?

Edit: I open up a command window shortcut which automatically runs c:\opt\ros\melodic\x64\setup.bat

I then use roscd to jump to c:\opt\ros\melodic\x64

I create a workspace folder (catkin_ws) there with a folder called src inside.

I run catkin_make inside or the workspace folder. This creates build and devel folders inside of the workspace folder and create a CMakeLists.txt file in the src folder.

Inside the src folder I type catkin_create_pkg test_package std_msgs rospy roscpp

There is now a test_package folder with the include and src folders, as well as CMakeLists.txt and package.xml files.

I then return to the workspace folder and run catkin_make again.

Then I run the setup.bat file in the devel folder of the workspace.

I don't have enough characters left to list all of the files and folders, but the above is what I do to get things set up.

Edit #2:

The output of rospack profile:

Full tree crawl took 0.765600 seconds. Directories marked with (*) contain no manifest. You may want to delete these directories. To get just of list of directories without manifests, re-run the profile with --zombie-only
-------------------------------------------------------------
0.718767   C:\opt\ros\melodic\x64\share
0.000000   C:\opt\ros\melodic\x64\share\doc\liborocos-kdl
0.000000   C:\opt\ros\melodic\x64\share\doc