Could someone help me with an Arduino Uno program?
Mansor Its not clear from your post that this is just a simulated system, not a real system to save peoples lives and I think people wanted to point that out for you, because the parts you are listing hardly fall into the safety critical category.  Plus if you are asking this level of question the chances are you software won't be very safe either (no offence intended), after 30 years of writing software I'm not sure I could write code good enough to trust peoples lives with!

Find libraries for each of the sensors you have listed and get them working one by one.  Then start adding them one at a time to your setup and loop functions.
For the SIM800 you are going to need at least 3Amps, so look for a 5A(?) wall wart.  You will need to talk to it over serial, software Serial works most of the time I think (never tried it, just from what I have read on here).
LEDs should be easy, just get them the right way round and remember the resistors.  All you need is a Digital pin set to output and then send high and low to it. (Again do it as a separate program and then integrate it).

This is supposed to be a sight for solving problems, and unless you have some code and a circuit diagram showing your problem you can get a negative response.  So tonight get the first sensor running or post why it didn't work (and your code) and people will help.