Hey! I'm not very experienced with male sex toys and only really used dildos and cockrings whenever I've fooled around with someone

Going to be meeting up with a pretty lady in the future and I've not had sex since February of this year and before that, 3 years! So I'm a bit out of touch stamina wise.

Questions:

1: Is it worth it to buy the Stamina Trainer or to get a standard fleshlight?

2: Would my size be a bothersome for specific fleshlights? 7.5x5

3: Is building a specific fleshlight better than buying a "premade" one?

4: how discreet is the boxing? Or would it be better to pick it up at a local mailing building (I'm a 22y/o still living at home with parents)

5: do I buy anything else to make this more pleasurable to myself and to maximize stamina growth?