Hi SLZz..these are all great questions, but there are also a handful more to consider before you start up a business. I'll start with the ones you asked, though.
First: What to do after editing pictures?
You have a huge array of options depending on your business model, and your target clients. Many people post early "previews" up on facebook with watermarks...but the danger here is that this lends to image theft and all sorts of issues with cropping out your watermark, people editing and re editing your pictures just because they can...and also some studies will suggest that your print sales plummet if you go this route. The reasoning is that people are more likely to buy prints if you meet them IN PERSON and reveal their very first look at their images at the same consultation. Some people will be content just seeing pictures on facebook, and print decent 5x7 to 8x10's of the facebook butchered images and never order a thing from you. (Facebook does butcher pictures badly in uploading.) You can use another online client album to previewing if you want to go this route...There are many available such as Smugmug, zenfolio, and others. These are not free, but they can be a great option that a lot of clients have come to expect from digital photographers.
Hard copies...your choice. When I was in buisiness, I put in my contract that I would retain all original files for x amount of time, after which all would be deleted from my hard drive. I would save all my final edited copies from each session in another folder, or on disc..but if you keep every single raw file you ever take indefinitely it reallyyy adds up on storage space! If you're shooting for paying clients, MAKE SURE that you have a hard copy and a back up copy of every file saved until the time you have agreed to delete the images at least...Or just wait for a hard drive crash and pooof all your pictures are gone ><
I personally do not release digital images to people.... When I was in cuisines, I would meet with them in person and preview the pictures on my computer. Then I would show them their options (sizes/prices/types etc..) of prints and other products, and I'd work out their order (with tax!). Keep in mind that about 40% of everything you make if you choose to go into business goes to taxes! I ordered through WHCC, but there are other great print labs out there too. Now that I'm not in business, I just post the edited pictures on my smug mug page and let friends/family order whatever prints they'd like on their own. I still don't give out digital files, except for the small watermarked versions on facebook.
There are a few decent free websites out there..but if you are serious about going into business I highly highly suggest paying for a professional quality one. Photobiz, creativemotion design and many others have great easy to use templates, with all the options you'd need. I just made a free website with wix.com..paid for my domain/host seperately, and I pay for my smug mug account. You can make decent websites with Wix.com if you keep them simple, but they are slowww to load..And you can also make reallyy reallyy horribly bad websites with wix.com.. Do so at your own risk.
Now..your potfolio.. This is the most important thing.. I suggest working and working and working on this until you are completely satisfied with every picture in it! Offer your services at a highly discount rate (and make sure people know this is a limited portfolio building offer) until you have a good array of pictures that demonstrate the areas you want to specialize in. IE..dont' offer wedding photography, but have zero wedding shots in your portfolio etc... You'll want to display your portfolio on your website mainly, and It's also a good idea to have an album made. You can do that with WHCC or any other printing lab, and put together some really nice templates to display your work. Another great idea I've seen done, is displaying your portfolio on an iPad.
Don't forget your liability insurance, gear insurance, tax information, business licensing, contracts, model releases, and most importantly don't go into business and start marketing yourself with pictures that down the road you will be embarrased to have your name on. Make sure you really know your stuff, and that you have confidence that you can produce professional, consistent results for your clients every time.