We will be having a day tour in Macau on March 18 via TurboJet from HK.

Fishman’s Wharf is the closest place to the Harbour, so you are suggested to visit the wharf at last.

Here is my suggestion:
Outer Harbour - Venetian - Tower – Grand Lisboa – Senado Square –Ruins of St. Paul – Fisherman’s Wharf – Outer harbour

Take the free shuttle bus of the Venetian Hotel from the Outer Hotel straight to Venetian.
Take bus 26 to the tower.
Take bus 32 to the Grand Lisboa.
Walk northwest for 10minuites to Senado Square.
Walk northeast for 10minutes to ruins of st. Paul.
Take bus 3/10 to Fisherman’s Wharf.
Walk north for 15minutes to the Outer Harbour.

I edited the sequence you gave.
Outer Harbour – Galaxy – Venetian – City of Dreams – Fisherman’s Wharf – Senado Square –Ruins of St. Paul – Grand Lisboa – Outer harbour

my question is, how can we go to fisherman's wharf from City of Dreams? Senado Square from Fisherman's Wharf? Grand Lisboa from Ruins of St. Paul?

is there a free shuttle from Grand Lisboa going to Outer Harbour?

Free shuttle bus needs some transfers to get to the places; anyway, here is the advice:

To Fishman’s Wharf, you need to take the free bus to Outer Harbour first, and then take another free bus to Sands Casino, which is in the opposite of the wharf.

To the Senado Square, you need to take a free bus back to the Outer Harbour, and then transfer to a free bus to Grand Lisboa. Then, walk to the square.

How to transfer to Fisherman's Wharf if we will not be taking the free shuttle? and how to transfer to Senado Square from Fisherman's Wharf if we will not be taking the free shuttle?
TIA

Take bus AP1 to the wharf and bus 3 to the square.