You will now need to work out how much money you will need to set up the business. This can be quite daunting but is essential. In the short term I would advise to keep these start up costs as low as possible, you can always buy or rent better machinery in the future as an example.
Once you are aware of how much money you need, you then have to find it. You may have enough yourself via savings or a redundancy payout, however most people are not in this position. If you do not have enough money, you could try and raise money via the family, by seeking a partner or by releasing the equity from your house. There is also the option of a business loan.