Hi Zak,
Welcome to the forum
I also have a Hobbymat with the optional milling attachment. There are several options for tooling:
1) If you are happy grinding your own tools buying some 10mm square HSS blanks will get you underway.
2) Sets of brazed carbide tipped tools are available quite cheaply, but the quality can be variable.
3) Replaceable tip tools work well but the cost of an initial set of holders and tips can be quite high.
The best suppliers depend on what part of the world you are in. There are members in most places who can offer advice.
I now use DCMT replaceable tip tooling for most work with LH, RH, Straight and Boring holders. I have a couple of blade type parting tool holders and some self ground HSS grooving tools.
I hope this helps a little.