I was recently told the schedule auto-generates based on what you put as your availability (IDK if that is true, a team member mentioned it the other day) and a leader tweaks it as needed before they post. So, for example, I'm in beauty so I'm put in with those hours. Those hours have been crap lately so I usually get hours from other departments also, which are added in after the fact.
Whatever you're putting down for availability is going to be what hours you get. Since you're coming in as new they're looking for it to be 99-100% open. My store doesn't have many issues or problems (we have an awesome SD) but I will tell you that if you're new and the other people in your department want the day hours, you'll get all the evening. You basically need to work your way up to the schedule you're wanting.
Since you're interested in a Team Lead position now or even down the road, I'd suggest putting 100% availability and meaning it 100%. What is nice about being a Team Lead (I'm not one, just my observation & what I've been told by another Lead) is that they have a scheduled closing lead for M-F and the rest of the leads split the weekend shifts on rotation. So M-F you're all day/afternoon shifts only.