Welcome to to Model Engineering, and the Forum.
First advice is DON't rush.
It takes a long time to learn to be a skilled machinist.
Also, be reasonable in your expectations. A hobby lathe is not a Toolroom, precision lathe. The price difference is several orders of magnitude.
Bear in mind that 3 jaw chucks do not hold work absolutely concentric. Expect something of the order of 0.003"
( 0,075 mm )run out.
You wouldn't buy a Cessna 150 and promptly set out to fly the Atlantic!
Learn how to use your machines and measuring equipment.
Learn by making small things, such as tools. A ) They will be useful, B) You gain experience and confidence in the process.
A Centre Height Gauge is easy to make, and will be useful A tool that is not mounted on centre height will not cut properly.
A Tailstock Die Holder set up is fairly easy to make and will be very useful.
Learn how to grind tools, and how to mount them. A badly mounted tool could scrap the piece on which you are working.
Better to scrap a bit of steel bar than an expensive casting from a kit!
Buy some books; money well spent and could save money bin the long term
Ian Bradley "The Amateur's Workshop" Among other things, says how to set up your lathe.
L H Sparey "The Amateur's Lathe"
Neil Wyatt and Dave Fenner have both written books on the mini lathe.
Harold Hall "Lathework"
You will need to budget for tooling. I would advocate, as a beginner, buying a bench Grinder and learning how to grind High Speed Steel tools.
HSS is more forgiving of knocks than carbide, and can be cheaper. For the cost of a carbide tip, you can buy a HSS toolbit which you can regrind several times. Also, when you need a specific tool form, you can grind it in HSS. Carbide you can't
Carbide has its uses, but less so for an absolute beginner.
I am a fan of Tangential Turning Tools. Only one face to grind. Sold commercially by Eccentric Engineering. But you can make your own. There have been at least two designs published in MEW. Can be made using hacksaw Files, and Drill with handwork, and measuring tools.
A Digital Calliper can cover upto 150 mm (6" in old money" for external, internal and depth measurements.
You will need to buy Drills, Taps and Dies, and measuring equipment.
Eventually, you will find a need for a 4 jaw independent chuck, which will let you into buying D T I s and a Magnetic base.
A lot of this stuff is Capital Investment., rather than Consumables., and you will be using thee things for many years to come..
HTH
Howard