You asked about a BA ( we call them PFD's) Your challenge is to get a
very comfortable one that gives you a full range of movement. They will
all get you up for a breath: IF THEY FIT!
Good strong shoulder straps are a must for possible rescues. In The
Hand of God rescue or simply a helping hand dragging you back into your
boat, your rescuer should be able to grasp good stout webbing on your
shoulders to do it. This saves misunderstandings.
A good BA or PFD is likely going to cost a bit. Mine is about $200.00
Canadian about 80 quid.
You won't need a tow harness.
I trust the boat has added boyancy ( air bags ) to displace water..
I am mostly a sea kayaker but like the last poster do a little WW.
That BA has to fit and be comfortable, That to me is one of the most
important things.
( of course I can't swim)....
Have fun. this is a great dsport.
When you get old we will steal you away to sea kayaking.