I'm new to rowing, how do i improve

i was in the gym yesterday and tried the rowing machine for the first time. i set it to 5 difficulty and managed to do 2k in 8:42. im not sure how fast this is, but i was wondering how to improve. should i row everday? i think i should focus on training back in the gym, are there any other muscles i should focus on. and laststly does anyone have a good goal for me to aim for im 18yo male.

thank you.