Question about grafting?

I have been doing a lot of research about grafting and still cant find the answers I'm looking for. I want to buy some rootstock to graft onto, I know that the time to do it is when both the rootstock and cutting are dormant. But what I'm wondering is if you can graft anytime of year? I would like to do it now with cuttings I take of my trees from pruning if that's even possible?

Also second question I was thinking of buying rootstock and planting it to let it grow and then use it for future grafts, Is that possible? what is the best way? Can you take cuttings off the rootstock to root first before grafting or can you only use suckers that come up?

there are definitely better and worse times of year/weather for grafting. for a beginner i'd recommend not getting too squirrelly with summer grafting...generally you do want dormant scion - do you have saved scion from pruning, or are you talking about pruning now...and have your trees leafed out?

you can plant rootstocks and let them grow to graft later. you could get some rootstocks and stool them if you really want to increase your rootstock supply yourself (i.e. making more rooted suckers come up). rooting cuttings from rootstock is probably not a very efficient way to go.

Unfortunately I don’t have any dormant scions. I just bought a few trees a week ago and need to do some initial pruning and shaping them. They are just starting to leaf out, some more than others. That’s why I was thinking since I am going to prune them now it would be cool if I could graft them, but it sounds like that wouldn’t be a good idea.

What do you mean by stooling the rootstock?