First horse Coming soon, Needs some various Tack Items!

Hello!
My name is Molly, and I'm a teen looking at getting my first horse soon. I've begged my parents for a horse for about the past 6 years or so, but finally they gave in! :)
I even found a great horse, which my neighbor took in and is now willing to give away, so finding a horse isn't the issue for me right now. The reason I posted this ad, is because I need to buy some various tack items, while sticking to my limited budget. Nothing has to be fancy, but just get the job done. I plan on riding English, and already have a bridle with a snaffle bit, but here's what I still need:
-All purpose english Saddle, sized between 16.5 and 18.0 (tree size M-L?)
-Girth
-Stirrup irons and leathers
-Saddle pad
-A good stiff brush (current one has bristles that are falling out)
-Halter
-Lead rope

I also need a helmet that fits. I have two helmets, both Troxel, but one is too small, and one is too big. I would definitely be willing to trade either one for one that fits. Camera is charging right now, but I'll upload some pics later of both.