You have set up your MAIN page by using the "TTG LR Page" template. This is you starting point. You now need to decide with TTG gallery template you wish to use for your galleries. Once you have done this (and installed it into LR) you publish your collection with that template to a sub-directory of the folder you published the TTG LR page to.
Please take the time to follow the instructions on the TTG site. They are complete and as well written as any I have seen, just a little patience and fault-finding ability is all that is required.
Looking forward to seeing the results.