Hi,
On the Sidewinder, you can only have zero to two hard point devices fitted.
Similarly, you only have a few compartments, and there's a lot of options...
For starters, I would suggest that you look at the bulletin board for some delivery missions. These aren't usually in dangerous areas, and will pay much better than trading a couple of tons of cargo.
Do check the jump range though, I had to remove the weapons in order to increase the jump range sufficiently.
In fact, I also changed the discovery scanner and shield generator for cargo racks. Obviously, that means avoiding interceptions if possible, if not, 4 pips to the engines, boost and weave/dodge until the step frame comes back online.
Fly safe.