Mow lawns and shovel snow...could probably borrow your parent's equipment if you take care of it...offer your customers a package deal, they pay you for a month's service and you will see them x number of times a month...give that at a slightly lower rate than the per visit rate and you will get more takers :) Subscription based services also have a lower turn over rate (meaning you will have the same customers longer) than per visit clients. If you want to make money you have to think of any venture as a business...not just an "I need money for something now"....but "I need money now, have always needed money...and will always need money"
Yes lawn work is best way. Most homeowners have their own equipment you could use. Also go around neighborhood asking neighbors if they would like to hire you to shovel for them. Ask them if they want 2 shovels or one. Meaning just shovel once the snow has ended or go once while snowing then again when done snowing. Do it soon ask them how they would like it shoveled, where to put snow, etc. Base your rate on how much they want you to shovel. I would tell them if it's a blizzard or "so many feet of snow" the price may be higher. Also even if they want just to shovel when storm ends I would still shovel twice to make it easier on yourself.