Well, the same applies to you at 28. Your free testosterone is already high, and this isn't going to change much with 250mg per week... Besides, it's more of a TRT+ cycle than anything else.
Anyway, you haven't given us any details... What duration and dosage are you going to use for the other things you mentioned? And I assume you're not going to be using Stanozolol all year round?
In short, you might need to rethink this.
And improving your physique/aesthetics? That can be different for everyone. What do you want? To look ripped and athletic, or do you want to look strong and big?
Depending on that, you'll need different things.
I'm not really sure how to help you. Try to be more specific, but initially... I don't see it as a good idea, especially for someone new to steroids.
Maybe an 8-12 week testosterone cycle at 350-500mg, and you can add Stanozolol if you want... I don't know, tell us more.