Wlk777
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In my opinion, a good option is to build 1-6 in the Castle, upgrade the Knights to level 111 (if you have at least 40 of them), and upgrade the Elves to level 113 (if you only have 7, you can skip this and just build 1-6 in the Castle). I almost never build a Guildhall in my main castle during the first week, except in cases where it's necessary for building other structures (Necropolis, Conflux, Inferno, Tower). I prefer to buy the spellbook on the secondary market.