Your best bet is to find some books, and educate yourself. Try and learn as much as you can and have fun while you do it. Although, you can always take the easy route and just go toa coinshop and get a professional opinion.
If the coin is .999 silver value is about $27.00.
How much is the 1943 coin is worth
It said in a coin collection book that this coin costs about $500.00
500
If it is the complete collection of 7 medallions it worth 75000$ cause it is limited edition of 100
Where do you sell a foreign coin collection and how do you know what it is worth>
About 10$.
You can buy the full collection o eBay for about £25
A cal jr. coin is not worth a whole lot of money, I myself have a few in my collection and are only worth a few bucks each.
I'll give you $20 for them
It would depend upon the condition of each coin.
How much is my fathers of baseball coin collection with the certificate of authenticity