If you want to mark the cards to show reversals, that's fine. However, as you become more experienced, you will find that your intuition will tell you where on the scale of 'negative' to 'positive' a card's interpretation falls. In other words, the whole range of meanings is contained in the card; whichever way up it appears.
There have been vast quantities of information published about tarot, whereas there isn't much regarding playing card interpretation, so to expand your knowledge of card meanings, keep reading tarot websites, like Biddy Tarot. There are lots of tarot sites out there. Another resource which comes to mind is https://teachmetarot.com/