Hi,
Welcome to SGL
I have used BST eyepieces in the past and they are really good eyepieces regardless of the fact that they are inexpensive. The 12mm and 18mm , I thought, were the pick of the range, very good, but I have no experience of the BST barlow so I cannot comment . I think you have chosen well, the 8mm will give 150x nice, for planetary, though barlowed to 300x may not get much use. The rest, 66x, 100x, 133x and 200x are a nice spread and will allow you to cover all bases, and get you well into the hobby whilst you discover where your main interests may lie.
Good luck and enjoy your new telescope...đ