starting with durable steel frame or lightweight alu is ok.. next time u can change
but get good groupset like latest ultegra (derailleurs chainring, and cranks).. no nid include brake (105 level enuff) and advice start with clipless right of the bat (ultegra class pedals + cleats, and a good fitting shoe is very important). Practicing good cycling technique prevent injury especially to the achilles.

Wheels and hubs dun worry so much.. unless u plan to constantly hit at least 40km/h

will inflate initial cost.. but if u plan gonna be long term next time can change frame to carbon or titanium, and port over the parts.
also alternatively if u dun like Shimano system u can opt for SRAM.

This post has been edited by lee_lnh: Jan 27 2020, 11:38 PM

new groupsets (long rear derailleur cage) has a wide range cassette 11-34T. While the standard highest gear 11T is rarely used.. too rigid and need a lot of power. the 34T is a new welcome especially for steep climb and for all rounders/beginners.
older versions supports up to 32T (which I am still using).

This post has been edited by lee_lnh: Jan 29 2020, 11:36 PM