what fees may i charges as a trading assistant

You can charge what the market will bear, but you don't have enough experience to sell for others.

Stick to your own listins until you hit 300 to 500 feedback.

Per ebay....But you need more feedbacks to be a trading assistant..

What kind of fees should I charge as a Trading Assistant or Registered eBay Drop off Location?
The fees you charge are up to you and the client to negotiate. Fees can vary by item type, item size, and item price. Perhaps you will want to set some sort of minimum fee or charge secondary fees for additional services you offer. The key point is that fees are in your control, and you should negotiate up front how you are going to handle them with each client. Another point to remember is that regardless of your agreement with the client, you are ultimately responsible for all eBay fees because you are the official seller from eBay's perspective, and these fees will appear in your eBay invoice