Will somebody teach me the basics of programming in SmileBASIC, please? :D

That won´t be necessary. SmileBasic teaches you everything. In fact on it´s website you can find a PDF called "Instructions-List". Combine that with the Manual and the help feature "?" that´s in the editor and you should learn pretty quickly. But remember, you HAVE to look to other people´s programs in order to learn. That´s my advice.

However, and if you want, I can help you out with a couple of things. Just tell me what you want to know and I´ll help you as much as I can.

It's okay! I'll check that PDF. Thanks!

By the way, i wanted to create something "horror" for my first time and this is what i managed to do

You can also find videos on youtube for it.