Hello Michael and welcome to the forum.
I'm not really sure that this is a suitable 'beginner' model, mainly because steam power is quite a specialised branch of model engineering.
I think my first move would be to join a club – preferably one that has members with this interest (boats and steam).
Failing that, I assume that you bought a plan for the model from Sarik ? They also have a section on model engineering, so you may be able to get plans for the steam plant "No.2" as well.
Alternatively, attend a model show (when we are able !) there will probably be someone there who can best advise you….you may even be able to source a 'used' unit to get you started. I would insist, however, on a boiler certificate for safety's sake.
Let us know how you get on.
Regards,
Dave