Is it wrapped individually ?

No. I found individually wrapped teabags at an event. The tea was delicious and I had two more cups. I bought 4 boxes of 100 bags to share with several friends. There was barely any flavor to the tea in these unwrapped bags. They came in a cellophane wrapped cardboard boxes. I checked the Use By date and it was three months after my purchase. I ended up giving two full boxes to charity and gave 2 boxes to my daughter to take to work.

Can the Asssam Black tea be used to make a milk tea?

Definitely! Black teas go very well with milk.

Is there any caffeine in the tea?

Black, green, oolongs, white - all these teas have caffeine. The caffeine content in tea is approx. 1/3 of caffeine of coffee. Caffeine level is very similar in all these types of tea as they all come from the same plant Camellia Sinensis. Teas can be decaffeinated through a special process. Also, you may opt for herbal infusions that are made from plants, that don't contain any caffeine, such as Chamomile, Peppermint, Rooibos (also called red tea), and many many others!

Does the english breakfast tea contain bergenot

Only Earl Grey contains bergamot, which is oil from Mediterranean fruit. Some Earl Greys might be flavored with other ingredients that give the same "begamoty" flavor and aroma.