I started reloading (again after about a 40 year gap) I bought all my major components, press, tumbler and rcbs 200-0-5 balance used, dies I bought new lee 4 die sets and I also bought a lee hand primer and lee perfect powder measure in hindsight I didn't really need that. I also bought lee case trimmers for my calibers and found the shell holder for those fits the hand primer or maybe it was the other way round. I also use home brew lub when necessary, 1 part liquid lanolin to 9 parts isopropanol. I'd recommend buying a couple of decapping/neck sizing rods, just a few $$ from lee, just in case you bust one. FWIW, my lee press dates from late 20th century and still going strong and about a year ago I had a part sent FOC from USA to UK to replace a broken toggle.
I bought some test weights for the balance off e-bay and had them checked at a local dispensary, fortunately they were accurate.
The biggest problem you will face, apart from the learning curve, is finding the right powder for your caliber, I settled on two, vihtavuori N 150 and hodgdons cfe 223 (for 308 btw)
With a big case like the 7mm RM you will need to follow the start at loads as religiously as the do not exceed loads as, apparently, too much airspace can lead to excessive pressures if you start below the start at load.
I've really settled on the n 150 as it's an extruded powder and seems to fill the case better than the spherical cfe 223 but loses some muzzle velocity.
Another hurdle you will have to overcome is in interpreting pressure signs and this is where a buddy can help enormously as long as he has 7mm RM experience.
I bought the lyman and lee reloading handbooks I prefer the lee one, except for the ads in the text. I also bought the cheapest magneto speed sport chronograph which is really helpful in load development.
Good luck with your choices.