I agree with the above post, if you can't deal with this mare, then it is best she go to a home with someone who can deal with her and has the proper equipment and time to help her; however, you should not get a foal. If you can't or don't want to afford training for this mare, the same will apply to the foal. You don't appear to have enough training skills to deal with it from the ground up, especially without a round pen, and would need to hire a trainer to help break the foal anyway. It's not meant rudely at all, but I've been around horses all my life, and have trained some myself, including an off the range Mustang, so I'm not saying it to be mean, but I don't want to see you hurt and there is a lot to it. Any mistakes made with a foal are often lifelong lessons, for both good and bad, and untraining improperly taught foals is very hard, and often doesn't happen once they are adults. Your best bet would be to take in the well broke mare, sans foal, and enjoy her, or else look elsewhere for a different horse.