Sounds like you did really well considering what you pulled after spending $200, but you can't expect to do that well all the time. Breaking even can be pretty hard.
1.Just google "Upper Deck Series 1 checklist" or the checklist for whichever set you're looking for. You should be able to find listings. For further reading, check out places like Blowoutcards forum, Sports Card forum, Clouts n Chara's forum, etc....basically any hobbyist forum. The more you read up, the more you'll learn about the "hobby".
2.DA Card World and Blowout Cards are both great places to buy cards online since you're in the US. You can get good deals on older product. One product I particularly like is 15-16 Full Force which is only 30 bucks for a hobby box now. They also have some good deals on past UD Series products. You can buy 24 retail packs of 14-15 series 1 (Gaudreau, Draisaitl, Ekblad, Kuznetzov, Reinhart Young Guns) for a buck a pack. On average, that should net you 6 Young Guns.
3.You might be thinking of O-Pee-Chee. O-Pee-Chee is one of the first sets UD releases every year. It is a low end set with a huge base set, lots of inserts, but the downside is the rookie class is always a bit lame since they don't include the top rookies off the bat but instead include holdovers from the past season who didn't get rookie cards yet. Past year OPC Hobby boxes are pretty cheap, for example the site I listed above has them at 26 bucks for a 36 pack hobby box from last year's OPC.
Keep in mind, Upper Deck releases OPC "Update" cards in Upper Deck Series 2. These update cards are the top rookies that I mentioned aren't included initially with OPC like Matthews and Marner for this season. If you want these, a good way to get them is just to buy them as singles on comc.com. You could complete the entire set of OPC Updates from 15-16 and 16-17 for very cheap since most of the cards sell for pennies.