@ccs007; if you haven't read FAQ/Rules doing so should help answer your questions.
If they don't it's best to ask if doing something is OK to do before you do it.
In any case, unless you post outright blatant SPAM, you'll need to work at getting Banned.
Generally speaking, more or less,
First violations result in a Warning - so you'll know you did something wrong. Warnings give you a "second chance"
If you do it again however, you may get an Infraction. This gives you a "third chance".
But if you get another Infraction then that could result in a Ban
"Three strikes you're out"
In other words the first time could be an honest mistake.
A second time and you're pushing
A third time and it's obvious you don't intend to even try and behave so that's it.
Also I use my own website's links in signature whenever admin will allow me. Overall I want to promote my website and also don't want to break SP rules. I want to use only resources allowed by SP admin.
You can have a Signature after you have been a member for 90 days - if we haven't moved to Discourse by then where there are no Signatures,
Other than that, you can pretty much put what you want on your Profile page. If you make good interesting posts the chance that others might be interested enough to go there to find out more about you are improved.