1) What are you looking to have made?
2) Details-size, dimensions, colour, artwork, thoughts, ideas. The more detail the better
3) How much are you hoping to spend?
Determine your proper pants size using a pair of pants that fit well and could stay up without a belt. If you are unsure always, go with the bigger size. Like tailors, we can always remove material but can never add more.
Be as specific as you can. Pant size 32 but a 31 would fit better if they made them? Put that.