Hello and welcome.

I wish we had better news for someone making their first post, but I'm pretty sure they are all replicas, I'm afraid.
#1: This is supposed to be a tetradrachm from Roman Egypt, during the reign of emperor Nero. Unfortunately this exact same coin can be seen several times on the forum, such as
this thread and
this thread.
#2: A very commonly encountered fantasy/replica of a "Widow's Mite", a bronze coin from ancient Judaea.
Here's just one recent thread with one.
#3: This one is actually supposed to be a replica of a gold "pirate doubloon", or cob-style eight escudos of the Spanish-American colonies. Likewise seen often on the forum, such as
this one which even has "COPY" in teeny tiny writing, near the guy's finger. The crown-which-has-devolved-into-an-owl is also a distinctive feature of these pieces.
#4: I can't quite see this one clearly enough to ID it properly; I think it's either Ptolemaic Egypt or a "shekel of Tyre". It is the only one of the five with any hope of being genuine, but given the company it is keeping, I cannot hold out much too much hope.
#5: Another commonly encountered replica, this time of a Crusader States coin of Bohemond VII, Count of Tripoli.
This thread has one.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis