Being 14 your options for work are a little more limited than if you were 18 with a high school diploma.
Since it's winter if you got any snow on the ground in your area you might be able to ask around get some snow shoveling jobs.
I did that when I was a kid and earned $400.00 in a month doing snow shoveling part time.
In the summer you could try doing lawn mowing or other lawn care for people around your neighborhood.
Maybe get some business cards and start your own lawn care company.