I’m afraid you can’t upload photos until you reach Trust Level 2, which takes about 15 visits, an hour of reading, and some posting and liking (so not too arduous 
). As soon as you ‘level up’ you’ll be able to post photos, though ones of your personal stash will have to be posted to a topic in the Your Photos category for moderator approval before they go live on the site. 
I think the main safety tip would be to not insert the bullet internally, as it may not come back out without medical intervention.
Apart from that, explore and enjoy.