Not sure if this is a serious question or not. There’s a lot of information about it elsewhere, but just to point out that there are a couple of things to consider.
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“Prot spec” doesn’t mean that no talents are chosen in other trees. So, even if someone is going with a deep prot build, they will likely be putting points into both Arms and Fury trees as well. So, whether those points should come first or not becomes an interesting question. For those who are convinced that Tactical Mastery is essential for tanking, then that would mean by at level 24 (as the OP claims to be), you would have 15 talent points. You could very well have 11/4/0 at that point, and still be planning a deep prot build.
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It’s perfectly viable to tank instances as Arms or Fury. Possibly even better, but that’s contentious, and at least in my opinion, more of a preference.
SFK is pretty easy to get groups for, and not a bad instance to tank. BFD is a little out of the way, and a little harder to get groups for, but I like it also. I’d go tank for a while. SM instances are going to be available pretty soon for you (sort of - around 30~) and those are a lot of fun, with 4 instances a short walk from Undercity or Brill, and 10 or so levels of fun (I think I ran Cath to 44, before going to ZF).
Here’s a Tanking Guide I put together that you might find useful, since you’re ‘trying to learn arms tanking’ - it might be a good starting point.