Hi! I was wondering what 3D printer I should get and where to get plastic? Also how to design one? I’m new to printing so I need help. Thanks!
Regarding plastic, maybe to check e-bay in your country? I have found that as the best option. Also, quality is very important; it is better to pay a little bit more and get the right stuff instead to pay less and get low quality plastic. You will be able to use it and will throw it in garbage, most probably. 
ABS plastic literally stinks and I think the fumes can be bad for fish, birds, small animals and some people. I do not know how bad the other plastics are except for PLA. I hear that PLA smells like cooking pancakes and you can compost it. The other plastics should probably all be recyclable. PLA is not as strong as many of the other plastics. You can make PLA yourself, but making filament out of it is an advanced topic.
There are two main types of printers. One is cartesian and the other is delta. I hear that cartesian printers are better for people new to 3D printing. Anymore, you can get cartesian style printers in stores like Office Depot, Staples, Micro Center, etc.
Plastic parts can only be used for some things. When printed, it is not as strong as when molded. You can use a 3D printer to make molds for metal (look for lost PLA etc techniques), clay, silicone, plastic, etc parts.
Check through some of the old posts on her and you will see many cool things. There are also some links in the community description.
If you 3D print for profit, avoid Creative Commons Non-Commercial licensed objects and be careful of what is expected of you. That or accept files and then print them. Someone made some blunders and was disrespectful lately when trying to do 3D printing for profit lately and it was a big mess.
1 a nice one
2 a shop
3 cad
I’m being facetious. It’s a long road and start with baby steps. Design would need some cad knowledge and you can get going with that asap. http://Www.freecadweb.org
Next if you’re going to buy a printer Google as much as you can you’ll need to decide on a type and the size you want to print. Try for at least 20x20x20.
Filament can be bought from many places again Google for suppliers in your area keywords like pla hips 1.75 should get you going.
I find this is a fairly good summary of the merits of the two main filament types: http://www.protoparadigm.com/news-updates/the-difference-between-abs-and-pla-for-3d-printing/
Personally, the things that should guide your choice of printer are: How much are you comfortable spending, what are you planning to print (particularly size) and how comfortable are you with modifying/building/maintaining the unit?
It all depends on your budget, The more you layout the better the printer. Stay away from plastic/acrylic frames. Most buy cheaper printers to start with, knowing you’ll be upgrading in time.
I researched for two years before I got my 3D printer in 2014 (or was it 2013?).