Finding quality equipment

I'm venturing into digital photography. Like I've mentioned in the past, I don't have the equipment and space to keep doing caffenol + black and white film photography, but I still want to take pictures. Digital will allow me to take pictures in color, learn a new medium, and it's more convenient. Because of my new interest, I have been researching like crazy what camera is best for me and what other equipment/tools I will need. I'm looking into purchasing a Canon T3i. Vlogger, Sarah Rae Vargas, uses a Canon T4i for her vlogs and I like the quality of her videos, but a college classmate of mine uses the T3i and I like the quality of her pictures. I feel that there wouldn't be much difference between the two. I'm starting off and limiting myself on how much I'll spend, so T3i may be my choice.
I've been looking for new and used cameras on Amazon, KEH, and B&H photo. I would look on eBay, because I got a really awesome macro lens for my Pentax K1000 on there, but I'm just really apprehensive about buying a camera or camera parts on eBay as of lately and for something I'm completely venturing into "blindly." I'm struggling on deciding whether to buy a camera body & lens together or trying to find the body for cheap on one site, then look for the lens on another. Again, I'm still learning and researching, so I don't know. What do you think? Comment below your suggestion(s)!
I asked my photo-friend about memory cards and batteries, she told me to get a battery that goes with my camera (Canon camera = Canon battery), so that's what I've been doing lately. I've added a few on my wishlist. I have to look for a reasonably priced battery charger and some memory cards, next. My photo-friend recommended SanDisk, which I have used in the past and usually lean towards. However, I found this awesome web page with memory card recommendations for the Canon T3i here [x]. Once I get the necessary basics, I'll look into a carrying case and a tripod. Maybe even decent photo editing software, Any recommendations on that? Anyway, I know I said I wanted to purchase some lenses for my iPhone 6, but after some research, I discovered that the kind that I want will not fit on my phone once my Otterbox Defender case gets here. I will have to take my case off to use the lenses and I don't have time for that. Taking my case off and on will stretch it out, plus the entire thought of doing that seems exhaustive/inconvenient. Maybe I will find lenses that can work around the case, maybe I change my mind and decide to go through the trouble of taking my case on and off. Who knows...