Need a 2nd pair of eyes

[redtippmann]

Well it has been a little more than a month since I started my job at a local photography company and I collected enough dough to get some useful equipment.

So.... I just wanted to see if I'm getting the right stuff. I normally wouldn't ask but I never held a c stand or a skylite so I am not sure if I would need any other connector. So here are some links to the products that I'm looking at (all links go to B&H).
Avenger A2030D Turtle Base Century C Stand Grip Arm A2030DKIT -

Lastolite Skylite Kit - Sunfire/White - Medium - LL LR81244 -

Avenger E650 Baby (5/8") Pin with Collar - 6" E650 -

Impact Empty Saddle Sandbag - 18 lb SBE-18O - B&H Photo Video

Thanks for the help!