I don't know if anyone can give you an honest answer to this question.
What to save for comes down to personal preference and servants you genuinely want to roll for. As a F2P player myself, i am patiently saving my quarts for what i want to roll for, i don't throw it around on every banner in an attempt to "fish out" a rare servant i don't particularly care for much. It's completely fine to skip banners you don't like.
You got a lot from the Tutorial Summon, considering that at least one 4 star is guaranteed. I myself got Marie and Siegfried.
I don't know what's in store for NA in terms of upcoming banners but i bet that you can go to https://www.reddit.com/r/grandorder/comments/7nrzy5/jp_banners_since_launch_v2/ and look up what banners might appeal to you. We're in the second picture, Waver and Iskandar banner is the current one. The next two, Cu Alter and Medb were previous America banners so we're skipping those and going straight to Kintoki and the rest.
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