Buy a battlechest, no unmerged account. 1-80 is no problem, it's YOUR account, your b.net Account and so on. 5€ is nothing.
If you know all quests there is no need for a SoR/Unmerged Account.
From 1-80 you can have luck and find a amazing guild with support, if you want on german servers don't join FULL server like aegwynn/frostwolf/blackrock/eredar, search a small (no ghostrealm!) server with a familiar community.
if you want to play on ENG server dont join outland/stormscale/etc.
too much players.