So to start off with, download TellMeWhen (http://wow.curse.com...tellmewhen.aspx), when you log in, you'll typically see this
From here on, it's pretty much personal preferrence as to what you want to add, we'll start out by adding Berserking for kitty druids. Hit enter when you're done typing the name.
You can also choose to track debuffs/buffs for arena1-2-3-4-5, as you would in macros, and friendly player names. I won't give an example here, you can figure this one out yourself in a Wargame. Just simply look in the drop-down menu, and you will find a wide array of configure-able options.
Now if you want the timer to show up, and counting down, as in the picture below, simply type /tmw, it will go invisible, but it will light up when an ability you have added is used, as so.
If you want to add a different spell, it's simple. Use the Berserker image for a 'how to' for enemy buffs, and simply replace the names. Simple.
Personal CDs can be anything you'd like to be able to watch, your trinket, a proc trinket, Anti-Magic Shell, Lifebloom, etc. This is how you do it. REMEMBER: Don't put the trinkets name like so.
put the entire effect's name, for instance, it's not 'predators swiftness', it's 'Predator's Swiftness'
For the last example: Re-sizing. It's incredibly simple, I still thought I'd point it out.
Now for interruptbar. It's probably the easiest I've done once I've learned it, firstly, download it (http://wow.curse.com...terruptbar.aspx). Once you've done that, and you log in, it will typically look like this (However I chose to move the order of Spell Lock, and Pummel)
Type /ib lock toggle true, and you just drag it by the pummel icon where-ever you want it. Now here is the part most people don't know. If you type in /ib hidden toggle true, it'll only light up when the spells on the bar is infact used, an example
Now if you want to add more spells, this is the tricky part, firstly look up the spell on WoWhead. For instance, let's take Throwdown.
To add different spells, you want to add (without ~) ~  = 45, ~ (with the comma) to the top part, ~ -- 85388 Throwdown ~ to the middle part, and simply ~ 85388, ~ (with the comma, unless you're at the end) to the bottom part. If you're confused how to do this, look at this screenshot for guidance.
Once you've logged back in, you type /ib hidden toggle false, and you can clearly see Throwdown added at the front.
And once a warrior uses Throwdown, it'll light up.
So, to conclude, if you need any additional help, don't be afraid to give me a personal message on AJ, I'll always try to help with any issue you have.
TL;DR: Stop being a massive doo-doo face and read it, shit is awesome.