I started with an Aim updraft 10 cu ft kiln with 3 burners in the center bottom with a bottom shelf about 6 in above the burners. It worked fine for bisk and could only get to cone 7-8 with bottom hotter than top for glaze firing, it was a great learning tool.
If possible find a manual on the internet or call Olympic for instruction on firing,and shelf placement.
There's a learning curve that is going to take some time but it's only Gas($$$) and pots($$$$) and time.
A gas updraft will work well and not fall apart on you as long as you are reasonably careful.
Study how they fire their kiln, ask question, take notes before you head off on your own.