Playing The Piano

Hi everyone! I wonder if anyone can give me some tips on how to learn the basics of piano playing? I have a piano in my room and I think it would be fun to make use of it once in a while and I also think my guitar playing will improve if I know some basic piano skills. I have a problem though. I find it a little hard to get motivation when I sit by the piano because I dont know what o start with? It´s a little boring to just sit there and try to memorise the shape of all the chords and scales etc. So how should I approach this?

P.S I find it hard to play with both hands. How do I learn to syncronise them?

Help With Ear Training

I wonder if anyone know a good way of improving your ability to figure out how to play songs by ear? Every time I try I usually get frustrated and put the guitar down after a few minutes. Should I start out with easier songs?

Problems with practicing.

Which is the best way to practice? Is it to learn new songs and play along with them(which is pretty hard some times) or should i stick to these masterclass lessons. The reason why I ask this is because my older brother thinks I have problems with my rhythm playing and that I shouldn`t play these masterclass lessons because it´s to early for me to play this kind of stuff. Unfortunatley he is discouariging me when saying so which is making me less motivated. Does anyone have any suggestion on what I should do?