It’s wonderful that you’ve decided to make teshuvah!
I’m sorry you’re feeling frustrated. But don’t feel like you have to become completely observant overnight. That makes people overwhelmed and burned out. Learn and take things on at your own pace.
Ask the Chabad rebbetzin if you could start meeting with her weekly to learn the halachos of everyday life. She will probably say yes! Ask if she can help kasher your kitchen (her husband may do that for you). Once you’re able to, move within walking distance of the Chabad house (or another Orthodox shul) and attend on Shabbos morning and Yom Tov.
Some advice: Start reading some basic guides to observance. For example, Shaarei Halacha by R’ Greenwald. There are also special books with the laws for women. Tznius is relatively simple: when you’re ready, start wearing only clothes that go past the elbows and knees; avoid very tight clothes or super bright colors; and stop wearing pants. Buy an Artscroll siddur (I like interlinear but there are many options) and start saying the morning blessings, and eventually work up to saying the major other prayers required for women (minchah, and shema and amidah of Shacharit). You’ll find that websites like Aish.com and Chabad.org and others have a lot of good guides to other aspects of basic observance. Pray to Hashem for at least a few minutes each day in your own words, thanking and praising him for everything you can think of, and asking Him to help you with whatever you need (including becoming observant of course), and end by thanking and praising Him some more.
Yes, there are seminaries for Baalos Teshuvah, certainly in Israel, and possibly also in the US. I don’t know any off the top of my head though.
Hatzlachah! Feel free to keep asking questions here!