MashaAllah it's good to see that you are trying to expand your knowledge! I'm not very sure about online classes as there are plenty of actual classes in my area but there are lots of recorded lectures/classes out there. While the problem is you can't raise your hand and as a question but I think you can still gain some benefit!
There are lectures/recorded classes by Nouman Ali Khan here
http://www.nakcollection.com/ some are audio and some video, the audios are mostly
tafsir of Quran.
Qurrat Al Absar [on the Prophet's pbuh life] (Total Of 13 Videos about an hour each)
Foundations Of Islam (Total of 7 Videos about an hour each)
I didn't list all the links of the continuation videos but I'm sure you can easily find them :statisfie