DCAM stands for Deep Cameo and is reserved for proof coins
it means that a porfecinal has authenticated and determaned the codition of a coin
PR is a grading system used for proof coins
It means "premium quality". It is not an official form of grading.
I don't know of any use of APB in coins or grading. ABP is occasionally used and it stands for Average Buy Price, or what a dealer would on average give for your coin.
The most expeditious way to get a coin graded is to locate a coin shop nearby - present the coin to the owner for grading. If he/she is uncomfortable to do so, he/she will refer you to a numismatist (experienced coin collector).
It depends on the coins date and mintmark. Modern DCAM Proof coins are very common and so are Mint State coins.
Proof
Mint status
"PL" in coin grading means "prooflike". It is used to describe a coin that has mirror fields and fine details resembling a proof struck coin but is not a true proof.
Lots of wear on the coin and the lowest grading possible.
Original Government Packaging
it means that a porfecinal has authenticated and determaned the codition of a coin
Less than good. The lowest grade.
PR is a grading system used for proof coins
Professional Coin Grading Service was created in 1986.
For an informal grading, bring it to a coin dealer for an on-site appraisal. For an official grading, it needs to be sent into a professional grading service.
A slabbed coin is a coin that was graded by a grading service. There are many grading services out there. You can use google to find some of them. Having a coin graded can give you the exact value and therefore is easier to determine its value.