Most guns won't shoot all bullets accurately nor will all bullets work in some guns.
Why not accumulate your lead, and equipment and while doing that try some different styles and size bullets in the general range of the types you like.
Bullet to barrel ,cylinder throat,and chamber fit are crucial,along with weight,length to barrel twist specs. Some designs work better for auto-single shot pistols and some are better with revolvers.
Study a lot cast a little, gain knowledge as you progress,and you won't be buying molds just to trade them off because they didn't work.
If in doubt about charge weight to bullet weight, always opt out for the next heavier bullet for the same charge weight, and always use the data for jacketed if the bullet weights are the same,jacketed vs lead.
Lee Modern Reloading Second Edition (revised) is worth the few bucks that it costs.