Most all of us started this way, more marbles, more marbles. But with time that changes for the majority. Sometime you will decided a certain marble you want, probably more than any you have paid for yet. You will get it and then ,move on to the next. As you get more experienced, some day ahead you will decided that you have to many or to many of the same thing. You will thin your early marbles down and focus more on quality and rare. But a few collectors never do this and are happy just collecting what catches their eye. Some collectors may have ten of the exact same $100.00 each marbles. The majority in time find one, two or three companies that they like and collect only those. Some collect only one single company, some collect only handmades or contemporary. But the majority like collecting a assortment. Collecting is learning, you always find that marble that you want to know more about. There are a lot of marbles to learn. It can last a lifetime. You will most likely change directions a few or several times collecting marbles.
Lots of people could make suggestions of what to goal for. But that may depend on what they like or collect. Some like $1.00 marbles, some like $10.00 marbles, some like $100.00+ marbles. Some collect them all. Just make the goal attainable and what you like. Once you reach that, then it is time for another. There is a very wide variety of marbles and variety of people interested in collecting them, learning them and their history. All reasons collecting marbles has many different rewards for each collector. You may find that you also collect some long time very good friends while collecting marbles.
Collect what you like. Change what you collect as you like.