Mercedes Benz repair: help!, diesel battery, amp battery

Question
Just bought 1983 240d and couldnt start it. i know that i have to warm the gp but im not sure im doing it right what i did is turn key to right and hold is this   right im brand new to the benz it would turn over and could see exaust but no run   thank you

Answer
How many miles on vehicle?
Geographic location needed = Florida, Alaska, etc?

The mustard yellow glow plug light should come on in the run position, then go out in thirty to one hundred twenty seconds depending upon ambient temperature = 75F to -40F.
When the light goes off, then you may start the engine.
The starter must crank the engine at 500-800 RPM, or it will not start.
Never crank longer than thirty seconds + if you crank that long the starter must rest for four minutes between cranks.
You need "at least" a one hundred AMP battery charger for charging the diesel battery, unless you have four to seven days to allow a weaker unit to recharge the battery.
In some cold areas, you must change the engine oil to a lighter weight to run in winter.

Note:
A fifteen AMP or lower charger is not capable of ever recharging your battery.