This is the single most complicated ship on the workshop, and while I really really enjoy the build over all, it's just way to much hassle to get her started and going. Good job on the build though, will leave a an up vote.

Uh...there are no helicopters in this creation...

This ship doesn't even have a helipad?

could you make one without the helicopters in order to make it somewhat less laggy

It happens, this boat's pretty complicated. Hope you enjoy!

Yea I missed a step, sorry bout that, thanks for the help.

Related: Please do confirm you're in Advanced. Most people are, but not being in advanced mode would definitely break this boat.

I cannot replicate this behaviour. I've been able to start the boat no problem using both the proper start procedure and my internal simplified one.

Try this:
1. Spawn the boat
2. Go to the machinery space
3. Turn on all breakers
4. Turn on, and cut in, the auxiliary generator.
5. Turn on Turbocharger Compressor LO and Turbocharger Turbine LO pumps.
6. Turn on Port and Starboard fuel cutoffs.
7. Turn on air start compressor.
8. When air start compressor reads 11 bar or greater, turn on Port Air Start Valve.

When the engine reaches 120 RPM, you should hear combustion start. If this doesn't work...I don't know what to tell you. I can't replicate your problem (the engines started fine), which means it's not an error in the ship's logic, and I followed my own checklist to a tee, so it's not a problem in the checklist. The only possibility is that you've maybe missed a step and you didn't realize. I wish I could be more help.

I've been trying it with limited fuel off, yea I have the pumps and fuel cutoffs on and the center tank seems to be full, its just that when the engine starts it immediately drops back down.

If the engines are spinning up to 200 RPM then they should catch. Check the fuel cutoffs, and turbocharger LO pumps.

Also, are you running in limited fuel and/or advanced mode? If not running in advanced mode, do so - this vessel was made in advanced. If running in limited fuel, ensure the CENTER tank has at least some fuel in it. Note that the refuelling points on the ship only fill the bow and stern tanks.

I follow the directions to start the ship and the engines do start when I turn on the start valve but they just go up to 200 rpm and spin down. What could I be doing wrong?

Please read https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2046761836&tscn=1586354870 . It contains this information in detail.

If you've already read it, feel free to ask further for clarification!