Ambitious ideas, but unsure how to make them reality

[Major Bach]

I do apologize for always asking questions. I really don't mean to impose on anyone, and I am sorry if I seem clueless. I humbly come to ask about some ideas Ive been thinking about lately. I would love to know how to implement a recharging night vision function into the game, as well as the ability to lob grenades at the press of a button. Obviously, I don't expect anyone to hold my hand and tell me how to do this, but I was just wondering if somebody could point me in the right direction? A tutorial or guide of some sort would be phenomenal. As always, any and all help is greatly appreciated.

[Hypnotoad]

Basically you will need to learn how to use decorate, try some of the guides here: http://zdoom.org/wiki/Category:DECORATE_guides

[Cruduxy]

http://zdoom.org/wiki/Main_Page

You don't only need decorate but ACS to execute those things.
The wiki will help with basics but you still have to open wads and learn from them afterwards. -or practice-

[Lord_of_D:]

the idea of the nightvision and the remote grenades has already made, but maybe you can make it different, take a look at wads like Ghouls vs Humans(for night vision) and All our War(for remote grenades), you may find an idea of what you want there. sure, learn a bit about all this with the advises that Hypnotoad and Cruduxy gave you