One quick note on the “naming” of coins. Each coin is generally named by the date, location of the mint where it was made and then the type of coin. For example a 1970-D Washington Quarter means that this coin was minted in 1970 in the Denver (D) mint and is a Washington 25 cent piece (quarter).
Another word of wisdom. You have a choice to make. Do you buy something rarer and lower quality or a higher MS and more plentiful? If it’s a Morgan silver dollar at $100, which is the better choice? It depends on what you will do with the coin. Is it for show? Then go for the luster and lower defects. After all, you want to show off your best. But if appreciation is the goal, a rarer coin might prove better in the long run. Either way, only spend what you can afford and have fun. Get a good beginners book for collectors and invest in the “Official Red Book” of US coin values. Learn what’s out there on the internet and visit a local