If I were starting out like you I would only really focus on three things: size, power (electrical service good enough for welder and big air compressor), and HVAC. You could prepare the cement to handle a lift, but I would hold off on that expense until you know you have the time to commit to car setup and maintenance. If you want some easier lifting mean while just buy a set of Quick Jacks. They work awesome and are mobile so you can bring to the track.
Keep in mind if you have a prep shop near by you can probably get your car scaled and setup for ~$300. You could have your car setup a lot of times for the cost of a lift and scale setup.