Hi there and a warm welcome to the forum. You will notice that almost all aspects of koi keeping has been covered on this forum under the various categories.
If you need advise on something specific, please tell us what the problem is and we shall be pleased to try and assist where possible.
Koi keeping is all about water quality. Maintain good water quality and your fish will look after itselves.
Be on the watchout for new pond syndrome. A new pond like yours will take up to 12 months to mature properly, and you have to try and boost your nitrifying bacteria and you will have to monitor your ammonia, nitrite and pH levels regularly.
Have you added fish yet? Do not add fish unless your pH is stable and within the acceptable parameters.
Please post a photo of your new pond and explanation of your filter system, and we can take it from there.