The suggestion of finding a mentor is a solid suggestion.
Lee products in my view, run from ingenious, to barely usable. Their molds for me, fall into the later class.
I have been casting, and learning, since I was a teenager, as my Dad was a caster, as well.
I have shooting buddies that use Lee molds, and get along fine.
Personally I think life is too short to use Lee molds.
If you do use them, they seem to work best if you dip your lead, rather than pouring it, and they are very temp sensitive, if you over work them. (Cast and dump too fast)
The equipment that a person uses depends on the quality of bullet you wish to produce, and the duration that you wish to play the game, as well as thickness of your wallet.
A quality Steel mold, will set you back over twice the cost of a lee mold, but if cared for will make 10's of 1000's of bullets, where the Lee will wear out way sooner.
There are several Lee products that work really well. One of these is the Push through sizing dies, that use your reloading press. One of these dies, and a squirt bottle of Alox lube will cover the sizing and lubing needs, and will save you a couple hundred bucks over a dedicated sizer / lubricator.
So long story short, I would buy a quality Steel mold, and a Lee push through die, and a lee lead pot, and a dipper. A couple hundred bucks, more or less, should get you started.
See if you like the process, and if so spend the money at some point for more or better equipment.
Best of luck to you.