Never too late, especially if you're in for the long haul. Bitcoin isn't going anywhere but up.
so do you think we should have some investment basics first before we invest or should we buy some bitcoins first and learn later.
It really depends to you since in bitcoin no one can now certainly if it is too late or is it a right time to invest in bitcoin so I suggest that if you want to go for it don't go all in just buy using a percent of your total capital to buy bitcoin just in case price drops. If not then try to short trade it and rebuy back when price is low again. That way your office mates won't regret buying bitcoin when price go up and your office mates won't also regret that they have not go all in when price dumped but it is still better to buy cheaper bitcoins.