How many people will you be feeding? Will you be wanting to sell any extra produce at a local farmer's market?

If you answer those questions, then appropriate answers will be easier to offer.

My initial thought is about 20 acres. You will need a decent amount of space just for the animals, then trees take up room and then the veggies. It all depends on answering my two questions.

Thanks for asking,
Jim

1) I'll be feeding 2 families (avarage 2.5kids? for now 0 kids, only 4 ppl but max 10 in total?).

2) I have no goal to sell anything, but if I get extra sure it wouldn't hurt :)

For 4-10 people 20 acres would be about right, but since your list includes horses, a cow, and an orchard, probably 25-30 would be better.

Not only do you need pasture for the livestock, but unless you are in a climate that allows year-round grazing, you need enough land to grow your own organic hay and other winter feed.

The livestock to acreage ratio will vary wildly depending on where you live and what quality pasture you have.

With the information you provided and the questions you asked, I would say " yes, you are not ready to take on such a farm". You need to spend time doing your own research as to how to accomplish your objective.. Get a copy of Carla Emery book, and use the internet ( forums, youtube vids etc.) to see what others are doing. there are many youtube on how to organic garden, chicken pasture production homesteading season extension gardening etc. Also, do you know how big 20 acres is? Depending on soil type , succession planting , labor and growing zone , 1/4 to 1/2 acre garden could provide plenty for 5-10 people. My garden of about 1200 sf. provides more than enough for 4 people in season (we don't preserve for year use as much as we could if we had more time) plus we give away or sell a lot of excess. I hope this is helpful

I would say you need about 20 acres to be able to do all the things you want.

However if you did decide to start growing to sell some of your crops. I would say you may want a farm in the 30 to 40 acre range.

And if you do chose to grow extra, make sure to list your farm on Agrilicious.org and they can help you find local consumers in your area looking for farm fresh produce.