Dual Boxing 2 Paladins

[Aegeis]

Hello. I am new to dual boxing, but have done the research and read the fine print, etc etc. Having said that, I created a tankadin and a healadin. Probably not the best case scenario, but I wanted to try it out and did not think I would have the complications as I am facing now. Perhaps it's just my setup? Here are a few things I am concerned with.

1) My tank (the lead of course) runs up to a mob, and starts wailing after pulling initial aggro. I press my "follow" key to make sure my healadin is near me and press the "assist" key but the healadin is too far away to take any action in melee combat; forcing me to press the "up arrow" in order to help attack the mob. Now again, I am new, so maybe I am just going about it the wrong way here. I thought I could have both toons run up to the mob(s) and hack away while the tank got low on health and my healadin would just heal. -or- Should I just keep the healadin where she is now and just use it strictly for heals and no melee combat? Basically here was my thought. I thought that if I could have two melee combatants attack the mob(s) it/they would die quicker. Again, I'm wondering if I am just going about it completely wrong. I'd like to ask for suggestions.

2) I have healbot. Am I going to have to ALT-TAB back and forth every time to heal my tank? I'm not sure of a way to just do that while looking at my tank screen. I use the software Keyclone, and I have separate windows open for the toons. I also use the addon in WoW that automatically accepts quests, group invites etc etc. I can not remember the exact name of it.

I think I have addressed my concerns and I'm sure that I will have others as my learning progresses. Currently the two toons are at level 20 and it's really challenging but has been fun. I look forward to the responses.