I want to develop a small but unique pc game....where do I start?

Answer 1

UE4 is one of the best open source engines, I also use it. AND IT IS FREE! You pay only if you succeed.
You don't really need c++ knowledge. Modern engines usually have their own programming and design kits. However you can use c++ with it.
UE4 for example have blueprint and a lot of tools.
You can develop any kind of games, from simple2d to AAA games and Android etc etc.
Unity is another powerful engine, it use JavaScript.

Answer 2

i think Ou should start with the idea:
write down idea
define rules

after you should try it on paper

if everything is ok so far... 90% is ok...

graphics
coding

Answer 3

@Aztecco Unity uses C#, not Java. ;)

Answer 4

If you're wanting to do it in C++, I would recommend checking out Unreal 4 engine. Great engine and it utilizes C++ for its scripting.

https://www.unrealengine.com

^Amazing engine. Doesn't matter if you're making a small or large game. Read through their documentation/tutorials/lessons and you'll get a better understanding of it. If you don't know C++ already, then read up on it as well.

Good luck to ya!