Sentences to be corrected. Thanks in advance

1. It I supposes that I am the one who has to go to and buy the floor tiles. [or "tiles for the floor"]

2. Right now, I am wherein they sell sold floor tiles. [or you can say, "... where floor tiles are sold."]

Sorry, I forgot to add this alternative.

2. Right now, I am wherein sold   in the shop where they sell floor tiles

Sentences to be corrected. Thanks in advance

1. It supposes that I am who has to go to buy the floor tiles

2. Right now I am wherein sold floor tiles

Hey Jesus:  A couple of ways to say these sentences, just as Eyram said.

#1  I suppose I'm the one who has to go buy the floor tiles.  or  I guess I have to go buy floor tiles. 

 #2 (easiest way)   I'm at the hardware store right now (buying tile).  DIY stores are huge hardware-type stores that sell everything home related: painting, carpeting, fixtures for the home or garage, etc. They sell anything you could possibly need to fix up your home or garden, etc.  DIY stands for  Do It Yourself.  hablamos pronto...

Sentences to be corrected. Thanks in advance

1. It supposes that I amI suppose that it is me who has to go to buy the floor tiles

You can also say:

I suppose that I have to go to buy the floor tiles

2. Right now, I am wherein soldthey sell floor tiles (the hardware/DIY store).