Good advice here. MEC 600 Jr. is hard to beat. Mine is nearly 40 years old and works just like new. I'd also emphasize a good manual like the Lyman AND reliable scale that will measure + or - 0.1 Grain. I consider the bushing chart recommendations to be rough guidelines and you need to check powder weights yourself.I am like you. Maybe a few months ahead in the shotshell loading department. I take it by setup you mean a press? I did a lot of research over a period of a few months. So I can only draw from that. I would suggest you do the same. See if you can get a copy of the 5th Edition Lyman Shotshell Reloading Handbook. the first part of the book is very informative. I ended up purchasing a MEC 600 Jr. Mark V for 12 ga. and I am satisfied. I also looked real hard at the Lee Load all but passed on it. A person does not realy need a press. There are also some kits that have everything you need tool wise in a small box.
Good advice on the mec 600 to start. 20 gauge is easier to get the setup right for. I would start there. I just sold my 410 versa mec. My 410 shooting is nil anymore. I can load a 3/4 once 20 gauge and get good results.
410 presses go high on used market. Unless you plan on lots of shooting sick with single get you process down pat.
If possible find somebody close by and what their technique.
Use good hulls, not every hull is friendly to reloading.
The lee load all does a fine job, just a little slower. If you find one cheap grab it. Great to learn on.