Prices for silver are still low enough to allow average buyers to take a position. This will not be the case for long, thus it's necessary to begin now. The initial question is doubtless, "What should I invest in?"
That depends on how a lot of money you have got to invest at initial. If your funds are limited, you'll be able to begin by purchasing a lot of common coins with higher grades of silver. If you've got more capital, you'll be able to search for rare dated coins (such as Walking Liberty half dollars minted before 1965).