you've come to the right place. :)
Generally, if you can post a list of the coins including the country, date they were minted, value, mintmark if you see one, and hopefully a photograph of the coin, the wonderful people here can give a ballpark figure on value. Is this your collection or did you inherit it, etc?
My recommendations to you:
1. Don't do ANYTHING hastily.
2. Do not clean the coins, or remove them from any packaging/holders.
If you already know those things, I apologize for starting with the basics.
3. Post pictures and descriptions here, for the CCF to help with basic value.
4. Find a local Coin Store (or two or three) and ask if they can look at it for you. Some stores will appraise a collection for free, or for a small charge, depending on size. If they give you an estimate on what they'd buy the collection for, think about it! Try to take it to another dealer for a similar appraisal.
5. Depending on what you want to do with the collection, you can sell it to the dealer, try to sell it in pieces, or (I don't recommend but it is an option,)
ebay.
Good luck!