Welcome Mallory. You're in for a fun time. How are you and your neighbor going to manage this venture? Does she live right next door? Are you going to share a single coop and a single flock? Or are you each going to have your own set up, and perhaps share brooding the chicks?
I've had successful "sharing with neighbors" experience. And, I can also envision how it could be the catalyst that breaks a good friendship. When I did it with a neighbor/friend, we got 25 layers, and 25 meat birds. I brooded the layers, she brooded the meat birds. We processed the meat birds together at my house, weighed the meat, and she took half of the meat home, along with half of the layers. We kept meticulous records of cost, and split the expense down the middle.
Having a neighbor who also raises a flock, or sharing a flock has the advantage that you can get away for a weekend, and be assured that your flock will be well cared for. That's not something that many of us have as we "go it alone".
The down side could be that your neighbor could "fall out of love" of owning a flock. Or not be around when it comes time to: pay the bills, clean the coop, see to it that the birds are secure from predators every night, let them out early every morning, feed them every morning, no matter what the weather.
You may also find that you and your neighbor each develop different management styles, and each of you can't abide the decisions of the other.
All thoughts to consider, and a possible reason to share the experience while you each keep your own flock and manage it according to your husbandry methods.
Before attending the seminar on Sunday, I urge you to do as much reading as possible. If this seminar is at a feed store, or even not, the presenter is going to have his/her paradigm about how a chicken is supposed to be raised. If the seminar is being run by feed store employee, realize that they have a vested interest in selling their "stuff" whether it's stuff that you "need" or not. Also, realize that such a situation puts the newbie at risk of "following the pied piper" and doing something a certain way simply because "the expert" says that's the way it should be done. You will also find that there are LOTS of varied opinions on BYC about how a flock should be managed. It's your job to sift through all the opinion, apply some scientific studies, and choose your own path.
I strongly recommend that you have plenty of room in your coop/run. A minimum of 4 s.f. in coop, 10 s.f. in run per bird (open floor space) is the generally recommended guideline for a back yard flock. Less space puts your flock at increased risk of parasites, disease, behavioral issues including feather picking and leading up to cannibalism.
A walk in coop is much easier to manage, clean, and correctly set up to provide for the needs of the bird. A short coop, often built on stilts does not have adequate floor to ceiling height to allow: a good deep litter, proper perch spacing in relation to the nest boxes, floor and ceiling. Even more critical is the fact that a short coop does not allow adequate ventilation. A coop needs lots of ventilation, while at the same time not being drafty, especially at roost height. Good ventilation will be at multi height, including some below perch and some at ceiling height. Recommended minimum is 1 s.f. per bird, or an area equal to 10% of the floor space of a coop. Your coop should have lots of natural lighting. You can use windows to provide part of that ventilation. All openings in the coop should be covered with 1/2" welded hardware cloth which is well secured.
BEWARE: PREFAB COOPS ARE POORLY DESIGNED, FALSELY ADVERTISED (in terms of how many chickens they will house), LACK APPROPRIATE VENTILATION, AND ARE OVER PRICED. I have yet to see a prefab coop that was not all of the above!
Brooding your chicks: If you have your coop ready, and can safely run an extension cord to it, you can brood the chicks right in the coop with a heating pad cave brooder.
@Blooie has an excellent article and thread about this method which is much safer than using a heat lamp. MHP brooding mimics the natural heat provided by a broody hen: providing a secure comfy dark spot to cuddle up for security and heat. I could write a book about the benefits of MHP in comparison to a heat lamp, but I suggest you read Blooie's information.
Medicated chick feed: You will hear varied opinions here also. "Your chicks must have medicated feed". vs. My experience: "I've never used medicated feed, never had a single case of coccidiosis." My chicks are exposed to cocci during the critical 2 week window of opportunity when the chick has her strongest immunity inherited from her mother. This is easily accomplished by giving the chicks a clump of sod from my yard! Not only does the sod have cocci, but it is loaded with beneficial bacteria and fungi to jump start the chick's digestive system. They also get: minerals, grit, first greens, tiny insects and seeds, perhaps a worm or two, first dust bath, and infinite play value!!!
Great to have you aboard and welcome to our roost! 
