Welcome to the great hobby of model boats, and the source of all wisdom that is Mayhem!
The Aeronaut Classic sounds like a great place to start. As it already includes a prop shaft and propeller, the additional hardware you need will be a motor, a speed controller, a steering servo and a battery. I guess you will also need a radio transmitter and receiver - if it was me, I would probably get one of the cheap sets such as
this. It will let you see if you are going to get deeper into this hobby without taking out a mortgage. As for the motor etc, you will probably get a range of views here, but you could call one of the major suppliers, such as
Cornwall Model Boats or
Howes and ask what they recommend. Both will also sell you the kit, so you might even get a good deal if you buy the complete set from the same source.
The kit says it also includes glue, so that should be sorted, but a decent aliphatic glue is what you should have handy in case you run out of the kit stuff, along with masking tape and clothes pegs for holding parts together as the glue dries. You will also probably need some filler. Even the best of us seem to end up with the occasional gap or blemish that needs attention. As this is mostly a varnished hull, I suggest you get hold of some decent mahogany filler from the local hardware shop - or online if the lockdown stops you getting to the shops. Lots of abrasive paper in various grades, then a good varnish - I have used
Ronseal Yacht Varnish to good effect, but you do need a lot of coats to approach that deep, lustrous gloss we associate with mahogany boats. For painting under the waterline, if you choose to do this, a can of Halfords spray paint in any colour you choose will do just fine.
Good luck, and enjoy the build. If you run into problems, the Mayhem collective will sort you out!
Greg