So with this Black Panther's Damage power he's able to roll Leadership,

On a 4 he gets a Wakandan Warrior on click 3 on a 5 a Warrior on click 2 and on a 6 a Warrior on click 1.

So my question is this;

Are you able to use support to heal these warriors back upto click 1?

SACRED RULER OF WAKANDA: Black Panther can use Leadership, but succeeds on a 4-6. When he does and succeeds, after actions resolve you may place a #AD014 Wakanda Warrior from outside the game in an adjacent square with an action token. On a result of: 4 That character begins on click #3. 5 That character begins on click #2. 6 That character begins on click #1 and doesn't receive an action token.

By the text of the power, it just says the character just begins on a certain click number and there is no starting line to prevent you from healing them up. A more experienced rules person could probably be more beneficial to your query.

Yes.

A starting click is not the same as a starting line.

The rules get very nuanced about starting lines and healing.

Regarding starting Lines, the E&C states:

The Wakandan Warriors only have a green starting line.

Regarding your question about healing:

and...

Since the Wakandan Warrior are NOT healing past their starting line, but rather their starting click, the above is a moot point.

Support is a-ok

Sweet thanks for the answer!

Now to just find a few cheap guys with support.

Try a white lantern wakanda team in a golden format. That should help you out with healing them up.

Do the warriors summoned this way count toward your opponent's score when KOed?

Yes, your opponent will score points for them.