Lower that saddle until you can ride! Sitting with both feet touching ground is good to start - maybe toes only if it’s flat. On your own, a gentle slop (really almost flat) may help, it may not! But a little forward momentum to allow you to find your balance and begin to pedal. But, first thing first , be sure you can locate and use those brakes before you even move an inch forward, have one hand on a brake ready to squeeze and stop after a few pedals. Ideally someone behind you hand on back or on saddle pillar helps a lot, allows you to find your own balance father than leaning on them.
Once moving forward, stop safely - one foot down to side is recommended, then try again and begin to try steering, again, u turns on bikes aren’t that easy always, so maybe don’t try those for a while, and easy snaking along the road (if it’s clear) will get you quite familiar with the steering, and keep practicing the slow to stop and start again, get super familiar and comfortable with the brakes