VB listview/treeview windows form application

This is to train me on listview. Make a working copy, then a vid of how you did it. 2 data bases. database one has "a, b, c, d, e, f, g". database two has 1,2,3 connected to a, 3,4 connected to b, 5, 6 connected to c and so forth. Make a combo box drop down contents of database A. When I press a button it will fill a listview from the selection of the combobox The listview will have a tree view of contents of database two. The tree view will have checkboxes so I can select only one number. And Lastly, When I left click on the the letter in the listview, a little menu will popup with the name of the colors red blue green orange and when selected the listview selected item will turn that color. this is a weekend project. Lets have fun with my little project. Remember this is to train me on how to do this