71 years old, Ah you're never to young to start 😀.
No problem, anything I can help you with just shout, if I don't know the answer someone else will.
The boat I'm building at the moment is an H A Kits morston (the small one) and even though I had a lot of various bits I still had to go shopping for an esc, batteries, propshafts etc 😀, Just reading through the various build blogs here gives you a good idea of what bits to get and where to get them.
With the Morston, space is very limited so I'm using Nimh battery packs for the main power and receiver, I've just ordered these from the component shop, they're pretty reasonable pricewise and they have a good selection.
The guys on here are very helpful, especially to newcomers to the hobby, and willing to answer any questions you might have.