An 'auto' is a plant that does not need the 12/12 light/dark cycle to flower. It has its own veg / bloom cycle no matter how many hours of dark and light, but it prefers more light hours A cola is any side growth that will produce a flower. Your plant seems tall and slender. I would suggest cutting her back a few nodes and letting her get bushy, develop more side branches, then switch her to bloom cycle. You will get a bigger harvest that way.
She does seem very healthy though. I fear you may not have enough soil in that pot, it's only half full. If you let her the way she is now, you will get one main big flower and maybe a few smaller ones. Since this is your first grow, maybe you should just let her do her own thing without interference.
Refer to the GWE site on topping and training plants to increase yield.
All in all, it looks like a good healthy plant. Keep up the good work.