Prestashop expert

I have following issues in my site: 1. We have 6 items total to sell but for 2 I can't seem to upload the image to items.. so need help to upload image. 2. The checkout process doesn't work. We have the site password protected so only with password u can enter site but then after adding to cart item it says: registered user or new register and enter email once enter email click to register it just comes back to same screen and doesn't go to next step... 3. check that hook up to paypal after get # 2 to next step is done the site is up and working.. all need is 2 images upload and make sure the check out process works perfect... In the items we have a T-shirt and crewneck attached is the images for each that we can't seem to upload. Then when we go to cart in site after initial password it asks to register or if have registered email no need for that.. just want a regular check out as guest enter address, and then go to paypal payment and order is done. I only want to accept payment via Paypal (they can pay with Visa, MC , AMex or other credit cards but only via Paypal) so the funds will go to my paypal acct. I don't want to accept the c.c. myself.