Start with asking yourself do you need a contract, work order, neither, or both? Most service businesses use work orders, not contracts. Yes, there is usually some legalize in a work order but not the same amount that is in a contact.
Contracts are written legal documents that describe, in detail, the responsibilities and expectations for the parties involved. Work orders are descriptions of services offered/performed and generally have a statement regarding payment terms and warranty. Neither of them prevent someone from taking you to court.
Now, look at the type of work you'll be doing and who you'll be doing it for. Say you will be removing a raccoon from a chimney, do you really need to hand the customer a 1 - 10 page document covering a breakdown of services offered and their rates, payment details, work schedules, cancellation of services, subcontractors, invoicing, standard of care, liability, remedy, independent contractor status, assignment, etc. or will a simple preprinted work order form with a handwritten line item saying "Chimney Raccoon Remove" and "Installation of Chimney Cap" do?
Keep in mind that whenever you use a contract it is best for the client to write it so they cannot claim misunderstanding and argue over services or payment.
For my business I only use contacts for bat work (and I have different ones based on residential versus commercial) and long term projects.