Give it a few cooks and she will settle down. Plus you will start to learn the way she likes to be handled.
Mine likes to be started with about 12 briquettes in the center and with 1 of the 4 intakes 100% open makes her rock 275 all day. Usually let her take about an hour to get up to temp.
She'll come around..
18.5" OTS, 22.5" OTG, CB Silver(Rip), Vintage Coleman Bullet, Pit Barrel, UDS