How to flatten out my yard without buying/renting big tools?

Hello, I am a new home owner here, and I don't know what I'm doing with yardwork. I've always lived in apartments. My backyard is very lumpy and uneven. Like they just got a bunch of random free sod and planted around until the yard was full.

I don't have much money to go buy or rent tools. I've got a couple of shovels (spade and square), rakes (hard and softer teeth), and a de-weeding tool. Plus, some hand gardening tools (shovel, fork spade, trowel, etc.)

So how do I go about flattening out parts of my yard so I can lay down bricks for a shed and to create a nice lounging area for an outdoor table and chairs?

I'm on a tight budget. Outside of bills and savings, I get a whole $30-40 spending cash left over each month.

Edit: For clarity since I guess I was too vague. The $30-40 is all I allow myself extra cash each month. I have my finances in order well and have credit cards and good credit to fall back on if needed. Houses are expensive in my area, and I had to use a good portion of my savings for all the expenses that came up with buying the place.

I've been rebuilding my savings and put a minimum of $200 each month into it for emergencies. Since yard projects aren't emergencies and weren't immediate needs, I won't allow myself to dip into those funds.

Hence why I'm asking how I can do it myself for cheap with my tools or ones I can get with my extra $30-40 a month

2nd edit: I should add that I bought the house last July and have been working on all the other priorities and rebuilding savings aside. And now we're onto the yard projects and are wanting to find out what I can DIY and what I'll need to save up for a pro.

I'm not afraid of hard work and I'm good with my hands. I'm just new to all of this stuff.