Welcome!
My English is very bad, but I will try to answer some questions...
1) Since you ask a SIM until you receive by mail tend to spend seven days (one week). Once you have received your SIM, you should re-enter the website to activate it. If it's portability, the process takes two days. But I understand that this is not the case, so this could be instantaneous.
2) This is an important point, because the law requires all companies have identified their users. I recommend you contact Suop support: soporte@suop.es.
3) The phone number is only used to send you information on the status of your order. If you do not mind this information, you could ignore this field. But since you also contact support, you can indicate your number by mail.
4) You can choose "calle" ("Street"); then, in the field of street name, you can start with "Rúa..."
I hope that you will soon be part of this community.