Personally I think a simple kit would give you a good idea of suitable materials and construction techniques without needing all the scratch building skills at the outset. Some people then practice scratch building by reproducing kit parts from raw materials and building from those.
100% agree for a novice. It will give you the confidence in the building, as you know everything is there and it has been done by others, and the confidence to go on and do a scratch build.
I would also suggest you go for a 'beginner's' level kit, as some are for experts.
If you are thinking you are only testing out the hobby and scratch build will be cheaper, unless you already have the tools, and a scrap bin (to make some parts) it may actually be cheaper to buy a kit.