You're welcome.

I know how confusing all the info overload is at first. Talk about your head spinning is putting it mildly!
I'm not sure where the best place to order a PCC from 'cuz I haven't bought one yet. I use a passthrough for my 510 and just carry 4 charged batts with me when I'm gone from any power source all day. A PCC is a great item to have though. Always check the Supplier's Forum and just skim through to check for Sales. It'll be posted so they're easy to see.
From China, I've ordered once from Bestecigs and three times from Eastmall. All four orders were shipped the next day and arrived within a week. I ordered from Eastmall during sales so it was a really good deal. David and Ed are great. Fantastic customer service. One batt I ordered was DOA (for my 901). I emailed Ed (customer service) and he called me (from Australia) and we talked for 4 hours! I was such a confused newbie and he was very patient and answered all my questions. He told David (in China) about my DOA batt and David sent a new one which arrived in 4 days. So, yeah, I'm a fan of Eastmall.
All went well with my Bestecig order too, although I ordered 10 attys ( a packaged deal) and 3 were DOA, but I haven't contacted them yet. I'll have to send the dead ones back, then they'll send me new ones. Eastmall doesn't require you to send anything back. They just replace it if it's within the first month after you get it. I've never ordered from Ruyan (Heaven's Gifts) but alot of people have and they've had good results too.
The 510 is a great choice, esp. if you have manual batts. I have the M401, 510, 901, and 801. I only use the 801 at home with a passthrough (too big for out in public) but I take the other three with me everywhere! I like the 510 and 901 the best.
Don't worry. You made a great choice with the 510 as your first ecig, although there's still a learning curve to get use to them with
all ecigs. And everyone decides on their own personal favorite models, juices, and suppliers by experimenting around.
Soon you'll be vaping away and experimenting with all they great flavors and your head won't be spinning from so much info overload!
