Which two to start with
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Why a pair rather than one product
A single product is a harder sell than a short range, and the second product costs much less than the first if it shares a scent and a shopping list. An oil and a balm share both.
The oil teaches you cold filling
It is blended at room temperature and poured into a narrow neck. There is no heat, no set, and nothing to go grainy. What it teaches is dosing, closure choice and the fact that a small bottle has very little label area.
The balm teaches you everything else
Wax and butter melted together, poured warm, and allowed to set in the container it is sold in. Pour temperature, cooling rate and graining are all real, and they are the same skills a butter and a shave soap need later.
They need different containers
The oil wants a narrow neck and a dropper or a reducer; the shelf behind it is 78 glass containers between roughly 15 and 120 mL. The balm wants a wide mouth you can reach into with two fingers, and that is a different shelf of 86.
And the balm has a container worth knowing
A balm is sold in a shallow steel tin, and the catalog holds seven sizes of one. 2 oz is the size this product is sold in, in silver and in gold.
One scent across both
A single fragrance used in two products halves the smallest order you have to place and gives the range a reason to be a range. It also means one allergen question rather than two.
What to add third
Aftershave, if you are willing to handle alcohol and glass, because it completes the shave side. Beard butter if you would rather stay with the same equipment, because it is the balm with a different ratio and a wider jar.