Call up some local leagues and ask about costs. Many leagues work with charities and provide reduced cost fees, donated equipment, etc. Many kids and teams find sponsors or do fundraising. You can also look at part-time jobs (baby-sitting, lawn mowing, car washing, etc.) to raise money. You could ask your extended family or parents to give you money or hockey gift cards for birthdays or Christmas. You can buy used equipment online, at swaps, or at stores which deal in used equipment.
Some communities have informal leagues which don't have much in the way of fees. You can also just practice at various rinks which offer open stating (which permit hockey players). Depending on where you live in the winter... you may be able to play outside -- and there may be informal groups you can join who play ice hockey on frozen ponds, lakes, canals, etc. Finally, many introductory classes are offered through community centers -- even if just learning to stake. Ball hockey during the summer is also a popular activity.