Of those, you have 2 options:
Go for the most “valuable” (ie, Gold, Silver, and then Bronze rarity items) or go for the most “in demand”
If you’re somewhat newer, I’d probably recommend going first for any immediate needs (look at the Servants you don’t have at their maximum ascension, and if you need a bunch of something, buy those).
Otherwise, if you’re somewhat newer but nothing in the shop helps you there, I’d go with:
1- Fool’s Chains. A ton of Servants need them, and they normally need a ton each
3- Spirit Roots
7- Magatama (new item, don’t get used by many Servants yet)
8- Mana Prisms (actually, make sure you have at least enough for the Summon Tickets from Da Vinci for the month. Those 5 Tickets are free summons)
That’s probably the order I’d go in if I couldn’t get everything.
As far as saving apples for Christmas is concerned, that’s entirely up to you. While lotteries are great, for most people the limit just becomes how much grind you can put in- it doesn’t matter if you have 100 or 200 Apples saved if you get tired of it after using 25, 30, 50 of them. In general, events are a good place to use Apples since the exchange rate for currency to items is much higher than normal farming. For instance, with 950 natural AP left, and a +3 bonus to the bronze currency (1 from the 1st mission clear, 2 from a MLB friend list) you’d be easily able to buy all the Fool’s Chains and all the Horseshoes in the shop- costing less than 950 AP vs. the average of 1900 AP to farm them otherwise.