In terms of your business, go down to your local enterprise office for starters. There is lots of free advice there, courses they offer (which will also give you an opportunity to talk to and learn from other people starting up and running their own business) and potential grants as well if you qualify.
I presume you are going to live in your property in the short term whilst you build the new house? If so, you need to give consideration as to how you will fund the new build.
In terms of your longer term finances, you need to factor in your wife's income as well into your planning and approach this together. Lastly, if you have not done so already, your immediate priority should be to ensure you have a will made and life assurance in place, just in case. Manure does happen as they say and you need to plan for it.