Take a brief Survey of Blackjack Tables and Blackjack Players
The first thing to do before looking for a seat is to find a table where you can enjoy, relax and do your thing with less interruptions and distractions. Avoid sitting with drunken players and slow players. They would just distract you and limit your wins per hour. Observe dealers too. Mean-spirited dealers will just tune you down thus interfering your relaxation and focus.
Try to avoid insurances unless the card counting
Be wary of insurance. Almost always, it is a sucker bet. It is not actually insurance but just a side bet that the card dealer has a blackjack. There's an exemption though, if you're already an experienced expert card counter, insurance might just make sense in some certain situations. But almost often, it's a dangerous choice to take on insurances.