I'd suggest you get a good release aid. Finger shooting a compound is doable, but difficult to say the least.
I'd recommend trying to find an archery shop, or hunting store that sells bows, so they can get your draw length set correctly and get the ball rolling a little quicker for you. If a local shop doesnt build strings, I'd suggest trying to find the stock string/cable length (either on the bow or on the internet) and having someone build a set for you. The ebay store 60x makes great strings and cables. Shoot them a message and ask them if they know the specs for the strings and cables, and what they'd charge for a set. https://stores.ebay.com/60X-Arrows-N-Strings?_trksid=p4340.l2568
A local archery shop might be able to build you a set of strings, but it's doubtful. Either way you will have to have someone install them for you.
Check out archerytalk.com's forums, avoid the fighting and banter, and soak up as much knowledge as you can. There are tuning guides, shooting/form guides, and all kinds of other information.