I am totally new in Arduino, so far makes two projects to learn - blinking led and infrared control. My question is - how to upload both sketches, or how to joint them together to have blinking led on output pin, and turning on/off (by IR-remote) another led on different pin? Both sketches separately works fine.
There is no magic formula for combining two sketches. You must understand what each line of code in each sketch is doing and use your skill as a programmer to combine them. Sometimes quite significant changes to one or both sketches will be needed.
A normal approach is to begin with the more complex sketch and add in the functions of the simpler sketch.
If you post your two sketches (use code tags!) we can advise you.