You didn't give enough info. I will still go ahead and give MY brief opinion on (3) of the available options though...
1) single stage... Great, conservative choice. Many have started here and never upgraded. It all depends on your personal wants and circumstances. You could always easily find uses for this on your bench even if you were to upgrade at a later date.
2) Lee Classic turret.... Much like the single stage, this would also be a great, conservative choice with a additional benefit. It can be used as a single stage and also as designed as a turret to speed up the process. This choice could very well be enough, depending on how much you shoot, to bridge the gap to upgrade to the progressive for a lifetime. It all depends on what your needs will be today and in lets say, 5/10 years. One word of caution on this press though... I don't feel this is as good of a choice as the single stage if you already know ultimately you will end up with a progressive and you do, for whatever reason, want to start slower. The reason I say that is because you can get money wrapped in this really fast if you aren't careful. How do I know ? I have done it ! A turret and pro auto disk for each caliber... Even more than (1) in a few calibers.... The convenience of switching calibers in mere seconds and be ready to roll can add up ! Up to the point a Dillion probably could of been bought.
3) Progressive.... Not too familiar here, but obviously the ONLY choice if you want to shoot larger volume with minimal time at the bench. About the only time I would advise against this option would be if your funds were limited. An example would be if you only had $20.00-$40 a month to spend on components. Imagine if you truly enjoyed time at the bench and you exhausted your components in a mere couple of hours... I enjoy time at the bench and I know I would be banging my head on the wall.
2) Lee Classic turret.... Much like the single stage, this would also be a great, conservative choice with a additional benefit. It can be used as a single stage and also as designed as a turret to speed up the process. This choice could very well be enough, depending on how much you shoot, to bridge the gap to upgrade to the progressive for a lifetime. It all depends on what your needs will be today and in lets say, 5/10 years. One word of caution on this press though... I don't feel this is as good of a choice as the single stage if you already know ultimately you will end up with a progressive and you do, for whatever reason, want to start slower. The reason I say that is because you can get money wrapped in this really fast if you aren't careful. How do I know ? I have done it ! A turret and pro auto disk for each caliber... Even more than (1) in a few calibers.... The convenience of switching calibers in mere seconds and be ready to roll can add up ! Up to the point a Dillion probably could of been bought.
Agreed! From the limited information the OP provided, #2 is the best choice. If you're shooting <500 rounds of ammo a year, a progressive simply isn't indicated. If you're shooting competitions and need a LOT of practice ammo, then a progressive is the way to go. Having done this for a day or two, I will say that it's foolish for anyone to load their very first rounds with a progressive. Batch loading with a single-stage, or a turret press so-configured, is a much better way to learn the process. Period.
To directly answer the question posed in the title of this thread: You get started in reloading by purchasing a quality reloading manual or instructional book and you read said instructions...preferably 2 or 3 times. If you still don't feel capable of proceeding, you work side-by-side with an experienced reloader for a while, or you can take a reloading class. Most of us got started using "A" or "B", but the classes are becoming more popular, these days.
^^^^^^This.Take a class with Aszerigan That helped me out alot.
Note: I'm not putting down learning on your own, or from an experienced reloader one on one, but for me...I didn't know any experienced reloaders to work with, so the class was the perfect jump start to learning for me.