Wanting some advice

Hey y'all I have be doing lot of thinking about going out as owner op and leasing landstar first thing I am saving up paying cash for my first truck I am looking into freightliner classic with Detroit 12.7 and 13 speed (open to other suggestions on other starter trucks) what do I need to look for in my first truck is there I hear about getting truck spec for what your doing wanting to do dry van and flatbed till I get the money for own authority then wanting to run reefer and flatbed what other stuff do I need to know about as owner op thanks I been doing lot of reading on here just can't find nothing as for specing truck

 

I am not in a hurry to make the jump I am just wanting too learn all I can so I got my ducks n a row when freight does start picking up

 

I have been looking into the 12.7 and I will go with pre emission are the fld any better in fuel milage? I just want something with room I am 6'8 so can't have flat top just looking for advice all I have drove is the new casciadas and I definitely don't wanna fool with any emissions spent tomuch time in shop now

 

I will look into them I wanna run paperlogs and any age truck would open alot up for me thanks sir