+1 to the idea of running stock for a while and getting to know your 1ers personality and idiosyncrasies before modding. This period of time is great for getting your preventative maintenance fully up to date- always a good idea before modding, especially with an n54.
If you're considering tuning, I'd encourage getting a cable and MHD with the logging license so you can verify the engine is healthy and be sure things like the coil packs & injectors are well behaved. Then at any time later you can simply pick up a map pack and within the hour add quite a bump in performance without turning a wrench.
After that it's all down hill.... as far and as fast as your goals & wallet will take you
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1and1
135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg