Small Formats are just the larger stores scaled down. In general, you will have team members that are "general athletes" that are trained to work in all areas of the store. Above them are your Small Format Team Leaders (who are all key-carriers), and then your SD. There are no old-school TLs or Sr.TLs (nor ETLs for that matter), but your job is comparable to a Sr.TL with the small-scale responsibilities of an ETL. An "ETL that is hourly at a smaller store" if you will.
I would imagine your store will also lack random departments (for example, my store doesn't have any toys nor baby department items or baby clothing, or media of any kind including books, music, and movies). The next closest small format to my store doesn't have any Food Ave. and my store doesn't have a Cafe. You will also have such bare-bones payroll on most days, that you are having to do your leadership responsibilities on top of taking care of a department or two by yourself throughout the whole day. That means brand, zone, fill, guest service, price change, and push all of an entire multi-department block (or two!).
You will also (probably) have only SCOs and one or two GS registers, which will kill you on Circle metrics. You also open and close the store with only a few TMs and you do everything from cash office, banking, and processing day to unloading the trailers (it's a live unload process - straight from trailer in dock to your vehicles the moment the truck arrives), to checking in vendors, checking on the team, driving metrics, filling in the roles of your peers, etc, etc, et cetera.....
In short, it is a lot, but can also be very satisfying and rewarding. Many of my peers agree with me and feel this has been an excellent opportunity to learn leadership and a higher-scope role if you are up for it.
Hope this helps! Ask away on any other questions you may have.