Should I start with flowering fertilizers? Is this autoflower already flowering? I am not sure because they are kinda small

Put her in the sun.

she looks to be in week 2 of flower, so yes start to introduce those bloom nutrients! You should up your watering volume too - good luck 👍

Yeah, shes been in flower for some time and unfortunately she hasn't had the best environment that's why I prefer indoor, mother nature can be unkind for an auto outdoors. I don't start to see pistils until the stretch is done.

This is beyond preflower.. this has been in flower for 7-10 days. You've already got tufts of hairs at terminal buds. preflowers are the single calyx per branch that 'can' form in vege phase, if it's long enough, but with autoflowers, pretty much means flower started the moment they started to form - which is a week or so before you can see them clearly. If new, i'd strongly suggest reacting to what you see, taking notes and use that to form a more proactive feeding schedule next time. You may run into more issues, but you'll better know how to supplement the soil in future grows -- assuming you use the same soil and fertilizers etc... If this is a soil, there are a bunch of variables that impact fertilizer needs... And, it'll be different for different soils and how they are constituted. One size fits all is great for soilless/hydro but with soil you need to be more adaptable. A feed chart may be a good ballpark to start (some blatantly tell you to verfeed, looking at you fox farm) but it will be different in every garden. Any chart telling you to flush constantly is probably over-feeding needlessly. There are methods just as effective where you don't waste a shit ton of fertilizer and pollute your local aquifer needlessly. keep it healthy... react to symptoms... take notes. Formulate a schedule that preempts the symptoms next grow... in 2-3 grows should have everything smoothed out. After that, try to boost this or that and see if it helps or causes toxicities etc... play mad scientist after you learn to grow supremely healthy plants. Outside, i wouldn't do so much training with an autoflower. May have hurt yield a bit. There is no difference in light intensity from top to bottom like there is indoors. So, just spreading it out is effective enough. Total surface area exposed to the sun is the key. The canopy does not need to be level and doesn't help on its own -- totally fine if it coincidentally happens trying to maximize leaf exposure to sun. The less stress on your autoflower the better in most cases. Some stress may be able to delay flower and cause a bigger plant to result, but it also probably isn't very consistent or predictable to do so. Unnecessary stress can just as easily flip it to flower earlier than normal too. If a particular behaviour is proven to consistently delay it, that's fine, but not something i'm aware of. Like trips to casinos, you only hear about the good times with anecdote.

Most of my feed charts dont cut out grow nutes until 2nd week of flower.

Yes, flowering is about to start, but in my opinion, it is too early to change to flowering ferts. I would give one more dose of "grow" fertilizers before switching to half grow, half bloom/flower fertilizers for the next 10-14 days and then, and only then, switch to straight "bloom/flower" fertilizers. A lot of people switch to "bloom" fertilizers as soon as they see pistils, but that is too early..............pre-flowers are only an indication that flowering is going to begin, it is not actual flowering. Cannabis still needs adequate nitrogen in early flowering and switching to "bloom" fertilizers too soon can lead to issues towards the end of flowering.

Yes, they are definitely flowering already! Since these are autoflowers, one of the first signs that they are transitioning into flower is the appearance of white pistils at the nodes and new growth. You can see those quite clearly in your pictures. Judging by how they look, I would estimate they are somewhere around the beginning to end of the first week of flowering. So yes, this is a good time to start transitioning towards your flowering nutrients. Just don't cut out nitrogen completely yet. During the early flowering/stretch phase they still need some nitrogen while their demand for flowering nutrients gradually increases. For a first grow they are looking good, so don't worry too much! 😊