May I Get A Little Help With Identifying These Coins, Please?

I know nothing of these, are they fairly common?

Your first coin is, as CGC stated, a Franconian Circle 4 kreuzer dated 1625. Here be the NGC page; I'd judge yours at least VF, perhaps EF. The "Circles" of the Holy Roman Empire were collectives of states, administrative subdivisions of the Empire; in 1625, the Franconian Circle was one of ten Circles, correlating roughly to what we now call northern Bavaria in Germany. Most Circles did not issue coinage; German coinage was more normally issued in the names of the various principalities, counties and duchies within the Circles.

Your second coin is not actually a coin. It is a type of token known as a "rechenpfennig", or counting-token; for those who can read abbreviated German, this is what "RECH.PFEN" is supposed to indicate. They are also known as Nuremberg jetons because the token-makers of Nuremberg were by far the most prolific in Europe. The initials of the token-master that made this piece, "E.L.S.L.", appear on the reverse: this rechenpfennig was issued by Ernst Ludwig Sigmund Lauer, token-master from 1783 to 1829. The date for this piece can be narrowed down further because Leopold II was Holy Roman Emperor only up to 1790. As for value, well, they're not coins so aren't listed in the mainstream coin catalogues, but here is one selling on MA-shops in Germany for 15 euros; it's in nicer condition than yours.