>>20160426
When you're just starting out, best to stick to trusted dealers like the ones at the top of the OP list.
Avoid ebay, leddit, CL etc until you know what you're doing.
You can do the quick tests in the OP, use magnets, do gravity test, etc. There's also an app that does the ping test, so maybe get coins/rounds at first.
Do some research on the coins/rounds you're planning on buying, learn the common counterfeit "tells", look at
https://www.fakebullion.com/index.php/resources/fake-bullion-database
and
https://www.fakebullion.com/index.php/resources/identifying-fake-bullion
Most importantly, post pictures.
Good luck anon!