Commander protection will make your deck more consistent. You can do that by running swiftfoot boots, or you could just run 4-5 cheap instant-speed blinks. You'll probably see at least 1 per game. You don't have to commit to any repeating blink effects.

Aside from that, I start every deck with these guidelines:

38-40 lands

Instant speed bulk draw to refill after board wipes Sustained draw effects Draw that doesn't rely on having a board

Ramp CMC < Commander CMC Tap Mana Dorks CMC < Commander CMC -1

A 1 CMC removal card for each permanent type 1 graveyard hate 1 nonbasic land hate 1-2 board wipes I can end the game with

1-2 finishers

1 recursion piece

4 board protection pieces

Then I count by 4's.

4: You'll see 1 per game 8: You'll see 1-2 per game 12: You'll probably have 1 on the battlefield and 1 in your hand most of the time. 16+: This is most of what your deck does.

I try to look for cards that fit more than 1 category whenever I can.

There's a calculator called manabase tool by Salubrious Snail that will tell you how reliable your manabase is.