@CrazyFastFlying In my personal opinion, I would look at a few other models with the intent of scratch building them. FT provides the plans for free, so all you need to do is print off the pages and you have a set of plans. Once those plans are printed you use them as templates on some sheets of foam board from a Dollar Tree store (hence the name Dollar Tree Foam Board or DTFB) and cut out your airplane parts by hand. Scratch building is by far the cheapest way to get into the hobby, and the best part is that it opens up ALL of FT's model inventory, not just the $18 speed build kits. You can scratch build just about every FT plane for less than $10, not including the electronics.
Don't get me wrong. I am all in favor of supporting FT with the purchase of their kits. However, I would hate to see you spend your very limited money on a mustang kit and instantly crash and ruin it. The mustang is a nice plane, but you want some experience under your belt before you fly it. It will test your reflexes.
That being said, I would steer away from the Cub for now. It needs to be built very carefully and lightweight, otherwise it will be a handful to fly. It's kind of a handful anyway in my opinion, but your mileage may vary.
As a first scratch build, I would highly recommend a Versa wing built in the tractor configuration with a powerpod. It only needs 2 servos (cheap!) and the powerpod can be moved from model to model as your fleet expands. Its easy to build, as it only has 4 large parts to cut out and a few smaller pieces like spars and winglets. The tractor versa can fly with a wide variety of motors, and is capable of slow, fast, and acrobatic flight. Really its a sweet flying airplane.
Here is a link to Sp0nz's plan index. All the model plans in one spot to download.
https://forum.flitetest.com/index.php?threads/sp0nz-plans-index.17136/