Autos are a whole different animal, they are good but they don't teach you much about growing. As was said better to stick to feminised photos for growing weight.
Learn to clone, start ASAP, don't wait it's not hard but you will have a learning curve.
Once you can clone and you understand the needs of the plant than you will be OK.
Bag seeds or cheap seeds and keep costs down.
If you can afford a 600 that's great, read up on ballasts b4 u buy.
If You have the funds get a 5x5 tent for your 600, flower in your tent and veg in a closet or the other side of the room.
That is my exact setup, except I run a 400 watt w 2 95 watt T5 side lights in a3x3x6 tent.
IMHO stay away from secret Jardin, I bought one and I think the gorrilas are better.
I veg under a four foot long 216 watt T5 HO 4 bulb fixture.
I run clones and seedlings under a smaller 4 bulb 95 watt T5 , veg and clone are in a strip closet across from my tent.
Everything in one room.
Just a few fans and my house AC set at 75 keeps my tent at 79-80.
Bless,
DZ