Something fun to try: Hold each for 30 seconds, a minute if you can. As a commenter noted, some of these are very advanced poses. Do the ones you can without hurting yourself. I need to start stretching to practice for dance.... this sounds like a plan.
How to headstand (sirsasana). Step one: head to a local yoga class to get in person instruction, then play at home using a wall. Start with your elbows one forearms distance length away from one another. Walk your feet in to get your hips as high as possible, then start by drawing your knees into your chest and pressing the earth away with your forearms. Once you feel balanced start to take your legs up. Use your breath to stay calm and focussed but don't take it too seriously.