Each person needs individual record sheets for their exchanges . Some systems use a cheque book and stub style system, others have a sheet where each person giving the LETS units signs the sheet of the person receiving the good or service. A small fee , payable in real money or LETS money, may be needed each year or season to pay for costs and maybe the administrators deserve some remuneration. Some LETS systems charge a small amount for a fee, others a larger amount. However, these amounts could probably be lower within a neighbourhood style system.
People can then start trading goods and services.
Have meetings where people can organize activities. At least one group has found that they get far more activity success by asking people what they need , rather than what they have to offer. Have a skills directory of the people in the neighbourhood. Have a goods directory of goods that people are offering to sell. Second hand building materials, old cupboards, anything.