If you don't have materials or money, that is okay. There are ways to get involved that don't require a financial investment
Attend your local fighter practices Attend your local populace meetings or business meetings Attend local guild meetings - there will rarely ever be a fee to attend a local guild meeting, and there are often supplies on hand that you can use to learn or try out crafts before you spend money Attend virtual activities Engage online in SCA spaces - there are a TON of SCA Facebook groups and discord servers that you can engage in for free