It would help if you include your location in your information. A lot depends on that.
I collected about three dozen white oak (probably not English) seedlings from flower beds around the building were my wife worked in the springs of 96 and, 97. The ones I still have are the trees in my collection I have had the longest - so it can be done even by a beginner. But it isn't as easy as you might think.
The flower bed dirt was soft. the squirrels buried lots of acorns and the seedlings were easy to find and collect. They almost all survived that process. Collect in the spring before they leaf out and get as much root ball as you can including the surprisingly long tap root. I put them, mostly in their own dirt, in relatively large nursery pots. The spring after I collected them a few never came out of dormancy. Others died as the summer came and went. The following spring I transplanted them into my bonsai soil thinking that might be the problem but it didn't help. Some did not survive the transplanting and I lost a few more over the summer. In another year or two I was down to ten trees, so I put them in the ground. They all thrived. I was amazed at how fast they grew. They stayed in the ground for four years. All I did was prune them back each year.
Then we moved, so I dug them up and again put them in large nursery pots. Over the next two years I lost half of them. Now I have four in bonsai pots - one was never going to be much of a bonsai so I gave it to a friend to plant out.
I was inexperienced when I began, as I believe you are, so I may have done a lot of things wrong, but this is what I now believe. Oak do not like to be transplanted, nor do they acclimate easily to life in a pot. They will try to put all their energy into one main root if you let them but if you do develop a nicely ramified root ball, they will thrive. If I were to do it again I would try air pots of some kind (search Vance Wood on this forum).
Good luck.