F***ING STOP POSTING USELESS ....sees admin I told you very clearly what you should do. I think a week has passed. Have you read a lot of tutorials ? We want to see your practice maps, but don't spam post room-sized maps.
One day you want to do something, the other day you change your mind.
You just have to know your limits. Trust me, as you are now you're not capable of making a modification for Half-Life. I don't want to discourage you.
Of course you can start it, but you will never finish it. Or if you do, some maps will be so bad that nobody will want to play your maps. You are going to hit difficult compiling problems that, for an inexperienced mapper, will seem to be impossible to resolve. And the feeling of deception will cover you and the enthusiasm will leave...
There is no point in starting a massive project. At least at your age( I'm guessing you're somewhere between 12-14). At that age your motivation can disappear as easy as it appeared.
I strongly recommend you to start practicing and leaving these thoughts for later. make singleplayer maps. But not an intire mod. Yet.
I hope you will consider my advices.