Hi Ellie and welcome to the pad! So glad you have joined us and found the pad for this wonderful hobby & fun! The girls here are wonderful and based on what you like there are gazillion of things to choose from. I use CS3 & CS6 and I also have PSE11 too... so your CS5 is perfect!!
What I like too is every Wednesday here at the pad is the SOSN (Something Old Something New) 50% off sale that the designers select items from their store and offer them at 50% off. The sale is a one day sale though. Also Fridays are 20% off designer new items and check out the Polly Picks and the trend categories as they are good sales as well.
Join in on the chats that happen... every month in the announcement forum they note what days and times the chats are and sometimes there is even a coupon for the shop for those who attend!! It is a great way to meet others here at the pad, and have fun. The speed scrap is a lot of fun and that is in chat form... the speed scrap is an hour in the chat room and similar to the MOC blind scrap where you get instructions. You have usually 1 hour after the chat to load your page to the forum. There is also a slow chat that is the same as the speed scrap but it normally needs to be done by the next day at 10 am or so.
If you complete all 31 MOC pages by 2/1 you will automatically get a $20 coupon to the store plus eligible for the drawing of permanent "polly"... that is a coveted position... everyone wants to be a polly!!!
All the designers here are great, so it is hard to say which kits to get as essentials not knowing what your "style" is...look around and window shop... there are always contests and such going on here, and the camaraderie of everyone is so great!!!
As Anne said go to the designer's FB pages... some have blog challenges monthly for nice prizes too and that always helps to build up your stash... ****WARNING**** make sure you have plenty of space on your hard drive or external drive as it is definitely addicting and you need a place to keep your stash!!
Hugs and welcome again!!