Alex, I first want to say welcome again to the team, and we're excited to have you aboard as a probie.

Now in answer to the question of uniform, I'll say that you should hold off on spending a lot of money. I say this because hopefully in the next month or so, we will work out our jersey situation and I'd prefer that you don't spend any money on something that will be replaced soon. If you can, find a cheap set of surplus BDUs at your local Army-Navy store until we get the jersey situation locked down. As for footwear, I'd personally recommend an inexpensive but durable set of cleats, slip-resistant combat shoes, or jungle boots. Cleats are good for places like Wayne's in most conditions, but boots are better for wet, muddy conditions.
As for the marker, I honestly have to recommend against getting an A-5 or X-7 unless it is an e-grip model. Overall though, I'd recommend something more like a Spyder Electra, Smart Parts Ion, or something else in that class.
Let me know if I can help with any other questions!