I'd like to start an organic vegetable garden but am renting so I need to be able to get rid of it when I leave here (could be in 6 months to a year). One thought has been to plant in pots so I need to know what and when to plant in pots as I don't think I can dig up their backyard (even though it's a mess of weedy grass).

Also can I plant pumpkins on a grassy sloping hill? I guess pumpkins wont require much soil preparation but that's only a guess.

I live in a coolish climate (on a mountain), in Tasmania Australia so it's Summer right now. Sunny almost every day but also windy and quite a lot of rain.

If anyone can help I would really appreciate it. Even if I can just grow a few things in some pots I would be happy but I am an amatuer.
Are the grow bags 'organic' veggie friendly?
There are some really helpful answers and I don't know who to pick! Thank you 🙂

I agree – see if they'll let you do up the garden.
But if they won't, I recommend using growbags.
We're in a rented place and the garden is all concreted over so we don't even have the choice to ask. But we grew loads of courgettes, tomatoes and cucumbers last year using growbags, dwarf beans and sugarsnap peas in pots, and lettuces and spring onions in windowboxes. It was our first time, but we got great results!
For pumpkins, I'd say plant them in a growbag and just let them spread down the hill. They are quite heavy feeders, but with a growbag the soil is already prepared for you, with all the nutrients they need!
If you want to grow potatoes, use a dustbin with holes and stones in the bottom for drainage. Plant three seed potatoes about halfway down, then as they grow cover the plants up with more and more soil until you reach the top (this makes the plant put out more and more roots, thus more and more potatoes!). To harvest, just tip the whole lot out!
It doesn't have to be as scientific and complex as the answerer above describes; just go somewhere that sells seeds, choose some varieties you fancy (for best results go for those that say they're pest resistant, disease resistant or highly productive), and plant them whenever it says on the pack.
Good luck!

I am about to move and would like to start organic gardening. Any tips on composting, making beds, watering, planting times and tips? I have a dog too and am not sure how she'll act. And i'm pretty cheap(read-broke)

I would suggest the first thing you do is read all you can on square foot gardening. You can get the book "The New Square Foot Garden" by Mel Bartholomew at your public library.

Also, look up information on the EarthBox growing system. They are self-watering containers that enable you to grow lots of produce (I've seen a picture of a very large tree growing in one) in a confined space. There are also knock-offs that you can build yourself with comparable results.

I would also suggest you read all you can on the internet about composting. The best time to start composting is yesterday ;o). I've always bought bags of compost from the store, but there's a great amount of satisfaction you get from doing it yourself.

I don't know how much space you're working with, but if you have a relatively large amount of space, I would suggest you grow your own seedlings. The biggest investment you'd have to make would be buying a florescent light fixture and a rack to put your plants on. You'll save big bucks over buying a lot of plants from the garden center. You will need to research planting times for your area. The biggest mistake people make (me included) is getting too excited and starting their plants too early.

One last comment. Check out the Gardenweb website. It's a wonderful community of knowledgeable folks who are glad to answer whatever questions you have.

Good luck.