How can I change my backyard from grass to brick?

Jennifer....You will need to level then lay the brick or pavers...whatever you plan to use. Hope it's not huge because if done properly the larger the area the more work of course. Good luck!

you will also need to eliminate the grass-it will come right back between the bricks-and underlayer might be a weed barrier, then sand, then the pavers as Tinyshoes said- 'LOTS OF WORK'

This video should help: How to Install Brick Pavers on Grass (Installing Brick ... - YouTubehttps://www.youtube.com/watch?v=sEGk-LE_jOo

dig up all the grass(6-8"s down to get all roots)layer of sand spread leveled out, then lay pavers on top leveling them as you lay them,fill cracks with sand(permasand is good)then rinse off your new patio/yard it's back breaking work but when you are done you'll be so proud of it....here are videos https://www.youtube.com/results?search_query=diy+patio+brick+laying+

I hope the area is small as the work to remove all the grass will be back breaking! You have to dig up all the grass, rake and rake until you get the area completely level, spray a ton of Round Up to keep both grass and weeds from reappearing, then finally lay down a thick layer of sand and rake that to make it completely level before you can begin to lay brick pavers. This is a heavy duty task to take on. You may want to look into hiring a professional.

Jennifer,

As you research how to do this, you will find conflicting points of view as to the "best" method. There is no "best" and there is always more than one way to skin a cat. (Who skins cats anyway???). The one thing we all agree upon is that base preparation is the key to a successful and long lasting installation. You did not mention where you live, and your location will influence the base prep you need to do. Your project is mostly prep. The laying of the brick will be the easiest part. Here is the Northeast, where frost heaving is a consideration, the base begins with a level excavated area a foot wider than the dimensions of your patio going down about 8". Landscape fabric is laid down, then a 4" layer of mixed gravel/stonedust (called crusher run or dense grade base) is laid in 2" lifts, tamped, and leveled again. Then comes 2" of bedding material, either mason sand or pure stone dust, which is screeded to a uniform surface. At this point some would say tamp your screeded material and some would say not to. Finally the brick is laid. You will have to decide whether you will use stone dust, sand, or polymeric sand to fill the joints. You are in for a lot of work, but the end result will be extremely satisfying.