OP: To answer your quesitons.
1. Stick with one powder. I like 4350 (does not matter IMR, Hogden or Accurate though you can't just do same loads with those - they are the same burn rate and characteristic area. 4831 is also a good one, R17 might be but would have to look (its very close to 4350)
Others are also good and can get more if not available in your areas.
A single powder of the ones listed will get you decent results at worst and a good chance of doing well. This is learning time. If not the best for your gun its not wasted.
3. Bullet: 130 or 150 grain as mentioned. Sierra, Hornady are pretty common, Hornady tends to much better prices. Hunting type are fine (flat base and lead tip) those can be quite accurate as well.
4. Get one of the good manuals. I like Horandy and Sierra as they both have very good instructions as well as good offerings of bullet types and powder.
If cost is an issue get an Hornady 9. If not so much, X is their lattest.
Sierra is about to come out with a new one, I would wait though both are my go to and I have two copies of Sierra - one a 1971 my wife found for meat a garage sale, I have 3 copes of Horandy, one is 80s, the other is 9 and I do have X (you can see I like Hornady.)
There are other manuals out there, but I like that both mfgs have the whole range of bullet types so you can work with their loads across anything you find by another bullet mfg (carefully, starting low and work up) - they give you a starting load, max loads, loads in bewtween and speeds for what it was shot in, what the twist is, primer used and the details of the casing for trim.
I would run a small batch of 10 to start out with somewhere between lowest and mid load. That likely is not a real accurate load but it gets you feet wet in the process.
After that work up at .5 grains and do another 10, .5 more and 10 more. Don't go above half way between mid and max just yet. You should find a load in there that is fairly accurte and then focus on 3/10 above and below that. Don't go past max yet, maybe never depending on your gun.
You should be able to size, clean, primer and powder the cases you have (after 5 rounds you will have to look at trimming).
If you are going to shoot it a fair amount eh Gerard tri trimmer works wonders, it comes all setup to you 270 with a sample.
You will need to get a micrometer sooner or latter. Decent steal ones for a low price. Don't get plastic, too much give in those. Low cost is fine.
I would re-consider wet tumbling. While its very good, its more steps and you need a sink and drains for it. Dry tumbling works fine and I have yet to pry the dry tumbler out of my brothers hands despite his love of the wet process (you will always use it for something)
The Thumbler Ultra Vibe 10 is a a very good one. If price is an issue then any of the Frankfurt ones are fine. They take longer.
A lot depends on how much you reload and shoot. Wet tends to lend itself to a return on bigger batches and more shooting.
If you do wet, just get a food dryer mult stack from Walmart, they work perfectly and cost a whole lot less than the ones listed by a reload mgf.
2. Primer: Thats a tougher one, you can't go wrong with CCI.
