Yes, welcome, there is so much to tell you!
Silja has a thread at the start of this section, about the TT course, with an idea of different places, but, I agree that bottom of Bray Hill is a must-do for a newcomer to watch from!
early arrival is key, i.e. 06.00 am early!for a good spot!
i'm sure more ideas will come up on this thread.

Gorse Lea another very, very fast spot, but there's a lot of places, all around the course, usually subject to you being able to get to them, buses, taxis, walking etc.