Welcome to the forum. Looks like you have a decent set of accessories there but you need to do some rust removal.
My preferred weapon is citric acid which can be bought as a little box of powder from the chemists. Mix it in some hot water and leave the parts to soak, maybe 30 mins for light rust, a lot longer for heavy rust, then attack it a mild scourer (e.g. a green pan scrubbing pad) or maybe a brass wire brush (the kind sold for use on suede).
Others may prefer products like Evaporust.
Your motor looks non original – nothing wrong with that though provided it works OK and may be more suited to continuous use than the original.