The server jar needs to be all lowercase and once again you need to use Java 8, not just have it installed, if you have any other versions of Java that your computer might be trying to use instead you need to use the full path to the Java binary rather than just “Java”
The first two pictures, try these instructions(They are for Windows but pay attention to the arguments given to Java when running the installer):
As for the third image, you need to use Java 8 to run Forge at this time.
No forge will never support bukkit and spigot plugins. There have been many attempts to do this and all of them have more or less failed. The closest you are going to find to something that you described you should look into sponge forge. You can also find most features that plugins implement in the form of mods. The other option is you learn how to code and implement the features you like from plugins into your own mod.