On the first hand, you will have to purchase domain & hosting. Feel free to discuss If you haven't purchased yet, I will guide you to buy a suitable hosting plan as per your business need.
Yes, the wordpress links structure is already SEO Friendly.
Yes, I always try my best to assist my customers even after the delivery is complete. I never want my customers hanging in between with confusion once they get the final product. So ethically I believe I should help and answer any questions and queries even once the job is complete.
I'll try again and again and I'll give my best to make you 100% Satisfied. If still, I am unable to make you satisfy then you will get 100% full payment refund.