Weight, how many grams can you throw minimum and maximum;
    A: Soft tip darts  You may throw as light as you want but be careful, too light and a sneeze will throw the dart off target. Most leagues and tournaments will not allow you to throw more than 18 grams as heavier darts tend to wear out the expensive boards quicker. No matter what, a 20 gram dart is the heaviest you are allowed to throw. You need to check you league or tournament rules to be sure.

    B: Steel tipped darts:  in regards to minimums  go as low as you dare. To the best of my knowledge the maximum weight of any dart is 50 grams.

Now that we have established  some guidelines the next question is what do you really want? Keeping in mind I can only suggest what to do, ultimately you will have to determine what you want mostly by trial and error. A real easy suggestion is strictly for those darters who throw both soft and steel tipped darts. Go with 16 or 18 grams. Naturally you will want to purchase a set of soft tip darts to make this work. You can purchase a set of conversion steel tips to exchange your soft tips as the need arises. You may like movable points or MP darts - those will work as well. You need only to replace those points with soft tips. The reason why is that you can legally throw the same weight in both  venues.

Okay, so you only  throw steel or soft tipped darts.  You will have to take into account the arc of the path of the dart. (In my opinion the straighter the dart is at it’s impact the more consistent you will be). You will probably need to have someone watch you from the side to determine how much of an arc you have. The more arc you have the less weight you want. However, if you have a lot of arc in your throw you may have more problems than just weight (I will enlighten you on  this  in another guide). A slight arc may indicate just a slightly lighter dart, about 2-4 grams, while a greater arc a suggests to reduce the weight by a  6-10 grams. What if you do not have a high arc? What if your darts consistently hit the board with the flight end lower than the point? This would indicate that you need a heavier dart. Please note that soft tipped players who consistently bounce out may be experiencing the aforementioned problem. Also note that by adjusting the weight of the dart may not fix the problem and, is not the only way to fix this problem. We can talk about that too in another guide.
 
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Here are some more guides you may find useful:

DART FLIGHTS WHAT WORKS THE BEST-SURFACE AREA

WHAT TYPE AND STYLE OF DARTS SHOULD I BUY?

WHAT YOU NEED TO KNOW ABOUT SOFT AND STEEL TIP DARTS

Who am I that I should write about darts? I have been throwing darts for about 22 years. In the Navy and locally in darts leagues, and of course for fun. Although I am by no means a pro I have learned a few things. And hopefully can pass them on so that dart companions can have some fun too. Speaking of the Navy-I also works on jets and studied with Embry Riddle Aeronautical University. So that I am able to pass down to you some laws of physics as they relate to darts. THROW WELL AND SHOOT STRAIGHT