Dale siddall

I'm new to the airsoft world and have been given a steyr aug airsoft rifle. I haven't a clue what to do and how to go about it so please would somebody be able to help me out I'd appreciate it soo much

I haven't a clue what I'm doing to honest I've been given the rifle and told its rhe battery

I think I need a new battery for the rifle pictured I'm new to this n I've been given the rifle someone please help me