Good choice - I bought the equivalent a long time ago and am still using most of it. The scale is fine, especially for beginning.
A tumbler is a 'nice to have'. For years, I dumped my brass into a sleeve from an old flannel shirt, squirted it with lighter fluid and shook for a minute. It worked fine. The tumbler does make it easier to see cracks and incipent case separations. Your call. Every pet store sells crushed corncob or crushed walnut shell for lizards and such; the 'official' media is more-or-less the same with a higher price tag.
As somebody has already noted, ditch the lube pad and goo they provide and get the Diamond wax. Far less messy, works even better.
You will need a container that meets legal specs to store propellant and primers. There's a sticky on it in Reloading.
You will need someplace to fasten all this gear to. It can be a dedicated bench, a WorkMate or even a sheet of heavy plywood clamped to a kitchen table.
A book to keep records of your reloading- what worked and didn't. You can buy special ones ($$$!) or use a cheap notebook.
Spare decapping pins and a split case extractor. You can get both for under $10 and they're good insurance. You never become really proficient with profanity until you underlube a case, rip the rim off and leave the rest stuck in the sizing die. Especially on a Saturday night when the stores are closed.
Good lighting - critical.
Good luck.