Few Questions: Backend order, Taxes and checkouts

Hello again.
After installing the new version i was very impressed by the many upgrades.
I have some questions i cannot find answers:

1. I would like to make an order from the back-end, if i do so, i need to charge the customer too. Example: i make an order filling all the products and info and when i choose the payment method nothing happens, so i cannot charge him via back-end order. I need the option Payment method to be able to run the onAfterOrderConfirm(), how can i manage that?

2. I need to have checkout by registration info. Means when i checkout without checkbox that says affiliate i want him to pay more for products and display less fields in the registration.
Example: An affiliate is trying to register, he marks the box and fields are added (Done that), now i want him to recieve a discount on some products and district him to only part of payment methods. When a normal customer trying to register, part of the fields are displayed and checkout goes without any affiliate discounts.

3. Can i have a custom fields visible or invisble in the registration depands on the products in the cart? lets say if this products is the only one then i want him to view less fields.

4. I have read the USA tax system and i did not understand one thing. Can i choose a different product price per state?


I know thats many questions.. but
Thank you very much for the attention!

ok so ill work on that..
if i want to display like paypal payment plugin that displays redirection to paypal and purchase through paypal, could that be implant in the back-end order?

Another question i need to find is the export button for orders:
If you can help me with that, it will be great..
How can i modify or view the .csv file? ( i need to export orders to excel)

When i open it with excel it just putting some html im the first column along the rows, surely this is not right..

im asking how can i see the params he is taking and manage them, and how can i view it normaly in the excel?

I changed to "under the title" and there is no html now, but the excel shows the csv wrong.. i added a screenshot

I have seen the export view and it looks good, i will customize it later.
Thank you.

Exellent. All done.
One problem is how can i set a fields to be UTF-8, because i have some hebrew text that is displayed as gibberish?

And another question, i managed to delete from echoing the fields i dont need, but the excel is showing me empty columns as if it counted them before..
How can i remove the spaces created when i filtered the echo by my require fields?

I added a screenshot to help you understand my situation.

I am trying to remove the spaces created when i told the export not to echo some fields.

like that:

if($key != "order_product_name" )
echo '"'.str_replace('"','""',$val).'"';

At the column name i used:

if($key != "order_product_name" && $key != "user_id" && ...){
echo '"'.str_replace('"','""',$key).'"';
}
Means i do not echo user_id ,order_product_name and so on titles.

and for the values i did the same:

if($key != "order_product_name" && $key != "user_id" && ...){
echo '"'.str_replace('"','""',$val).'"';
}

Means i do not echo the values of all fields named user_id ,order_product_name and so on.

Somehow the excel still consider the columns and fill them with blank. (as seen in the screenshot)