Welcome to reloading and thanks for asking our advice
Is it better to buy my reloading stuff separately from different brands or get a kit? Is the RCBS Rock chucker kit good?
A kit will get you loading quicker. Assembling your own kit will force you to THINK about what you are doing more than a kit does. What's that extra knowledge worth?
Any kit will have extra stuff that is a waste of your money and a waste of space. No kit has EVERYTHING you need, so you will be supplementing it with extra purchases (or, if you are lucky, trades). You will also, after you develop your particular style, trade off some stuff for other stuff you like better, but that applies to kits as well as self-assembled outfits.
One can begin loading with but three things.
Press because fingers are not strong enough to work metal
Dies because fingers are not precise enough to work metal
Scale (or powder scoops) because eyeballs are not precise enough to mete powder charges.
Everything else enhances 1) safety (e.g. safety glasses or a good scale), 2) speed or 3) convenience (e.g. applying case lube with a lube pad instead of fingers).
If you live near a retail outlet, you can get the bare essentials and add to them as you see the need. I loaded for a decade before I ever had a bullet puller and another several years before I needed to use it. I didn't have a tumbler for over 30 years, but just wiped my brass down with terrycloth or old t-shirt. My brass looked grungy, but shot just fine. Now that I have a tumbler, my brass looks better, but shoots just the same.
Tell us what your shooting habits are (and your expected reloading habits) and your future goals. Supreme accuracy at distance? Lots and lots of informal paper punching? Formal competition (IDPA, silhouette, etc). Hunting? Help us help you. Our advice will be more on target the better you inform us of your needs and expectations.
Good luck,
Lost Sheep