Hi!
Congrats on your first steps towards a healthier life!
if you jump right in only eating 1200 calories and bumping up your exercises a great deal, you are not going to stick with it. most likely, you'll find yourself a week later binging to feed your poor, confused body that suddenly feels like it is starving and overworked.
just modify your lifestyle. plan what you are going to buy for specific meals before going to the grocery store. cutting out (or lowering) sugar intake is a great first step. i did this a while back and it changed my life. not so much in weight as it did in metabolism etc. but i noticed that although i was eating more than i had previously, cutting out sugar allowed me to lose 5 pounds without noticing! cutting out white flour/starches is another good idea, but i'd encourage you to keep in some whole grains. there are so many grain options out now.
another thing i started doing is eating all day. and by this, i don't mean binging constantly. i eat around 5-7 times a day, depending on my schedule. eat 3 smaller main courses, and provide plenty of snacks in between, even if it's just a piece of fruit. this keeps your metabolism constant and makes you less likely to binge later at night. any time you are hungry, eat something. and when i switched to this plan, i noticed i had to eat even when i wasn't all that hungry because i used to only eat 2 times a day (bad, bad). get used to this and it's kinda fun...
but yeah, i'm not sure what the weather is like, but it's great to just incorporate more walking into your day. i had no choice in this as i am a pedestrian without a car, but you can modify your usual routine to have more physical activity involved. don't insist on having a heavy workout everyday. start with a few times a week for 20-30 minutes a day.
most importantly, you want to figure out something with which you can stick. you want this to last, otherwise it is pointless.
Good luck!!