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If you quickly want to select or navigate to an entity, go to Map -> Entity Report..., and enter the class of the entity in the "by class" textbox. You can also search by targetname or other properties in the key/value field. This is very useful if your map grows in size and you don't remember where you put a certain object.
When you're testing your map in single player through the Create Game menu option, you will still get the "Waiting for players" message. To start the round and see if everything is in order, you can add bots. Open up the console, enter sv_cheats 1, then sv_lan 1 and finally spam bot_add a number of times. You'll still have to wait a bit for the round to start.
If you're like me and don't have a keyboard that allows the console to open, the easiest way around this is opening Steam, right clicking on PVKII, opening its Properties and adding
to its Launch Options.
If you look at the template .vmf, you'll see that the func_territory, trigger_hurt and func_brush brush entities are all inside of each other, making it hard to select the right one. You can click and hold with the Select tool in the Perspective view to cycle through every object under your cursor. It's a good idea to keep the Properties windows open while doing this, so you can quickly see what object you have currently selected.
If you want a fifth territory with the two additional features, you don't have to go through the effort of manually remaking every brush entity and setting up the Input/Output chain. Simply select the group of objects you wish to duplicate, hit Ctrl-C, and then go to Edit -> Paste special.... Check the Add this prefix to all named entities option, and enter a meaningful prefix there. Hammer will then not only add that prefix to every copied object, but also automatically fix the names in the Input/Output chain for all the new copies.