As for the first question, in both Moodle 1.9.x and 2.0.x once you go into html mode, none of the buttons are available. The buttons are actually macros that apply the html commands, and are available in the wysiwyg editor, but not the html editor - no need.
A word of caution here, if you or your team do not know a lot of html, then do not go there. Having said that, there are a lot of free tutorials on how to write basic html on the web, like W3Schools, about.com, and lots and lots more. All you need in Moodle is the structure and format, ie style, commands, or tags. The way Moodle is written fills in all the rest for you. HTML is really easy to pickup, I have taught it to absolute beginners and they were writing their own web pages in just minutes.
I do not understand the second question, but if you are wanting the same thing, then the same answer applies.The editor bar should come up automatically whenever you are writing anything in Moodle other than a text file.
if you are asking about editing html files you have imported into Moodle, then you can do so, but not with an active tool bar, for the same reason, the buttons are macros that supply the html commands, so no need for them in html mode.
(P.S. Never apologise for language, my Spanish is dreadful.. )