Sorry guys..

I'm having trouble understanding...I consider myself a newbie..even though I spent 6 months of intense training...

Anyways, I've attached the screenshot of what I did so far.
I converted the inside shape to polygon. 1200 count...(Is that too much count? .. question #1 .will it slow down rendering speed?)

Then I selected the edges...to do.maybe planar?

question #2. first of all.. is it ok to use surface tool on polyon models?

You guys said to merge..the vertex or connect them...

question #3. Can any of you guys tell me how to do that?

I want to make this tub one object. with round corners and edges.