Hi Dave ...... welcome to the forum
Thanks for looking at the Smallstream line. Since you are new to trout fishing, I would suggest one of my 5ft light furled leaders, as these have a seamless ring to tie your tippet to and you are likely to change flies more often when you start out ( you can explore other tapered leader set ups as you progress and find your personal preferences ) I would add a length of 5X tippet to that for the fly sizes that you mention and might also carry some 4X for sub surface tactics, or bigger flies.
If you do order the line, I will weld a micro loop on the line for you, which will help to make a 'loop to loop' connection of the line and leader strong and easy.
I hope that helps.
Best wishes
Mike