Don't let "expectations" get the best of you!
You're going to find more pennies more than any other coin out there! They are lost by the millions. You will get your share of other coins too, it depends on where you hunt as to have better chances for other coins (especially) older coins, and or jewelry. If you hunt in school yards that are 20 yrs old, you're NOT going to find silver & old coins. If you hunt places a lot of other detectorist hunt, you're going to find less because of all the competition. If you hunt places people haven't lost rings and the like, you're not going to find any.
Just because you set the detector on "coin mode" doesn't mean it's going to go out and find coins for you! You have to put yourself where the coins & jewelry are! Then it depends on your skill level, detector quality, settings, and instincts, etc.
People that are new to this hobby (usually) have over blown ideas and expectations on what they will find and in what quantity. They are mis-lead into believing that all you've gotta do is buy a detector, set it on go, and find all the good stuff with little to no effort, and or little to no junk! The guys that have been doing this for 20+ yrs as I have, know what I'm talking about, and know it's true! You also can't believe everything thing you "see and read" here on these forums! Although most are sincere in their postings, there are those who are not, and they like to post/brag about all the wonderful unbelievable finds they make almost daily to toot their own horns- so to speak, and to make it look like they're finding all these gold rings, silver coins, etc. BUT in reality, they pulling your leg, and making fake post, showing things they've bought, etc. and basically lying to your face.
If you enjoy the hobby, do it and take it as it comes while learning your machine/s. It's not all gold at the end of the rainbow. It takes time and effort and many 100s of hrs of using your machine/s, and digging, and finding places to hunt, etc. before you? a mass an array of cool stuff, and good finds! And that's after finding/digging 1000s and 1000s of junk items all along the way.
If you're the type with little to no patience, believe you're suppose to find stuff of value every time you go out hunting, and or believe all that you read, and see on these forums, you're in for a big let down, and may want to consider another hobby..