The facility is were you will be staying which offers great opportunity's.
First: try to find anything of use around the facility, There is a lighter and a few cigs upstairs on the table next to the backgammon table. And are few buckshot shells in the mission room (where you accept objectives).

Second: The points you get from completing an objective can still be earned when a critical objective is ready (Please tell me if i'm wrong, I can't remember).

Third: If possible try to get objectives near each other so you don't spend too much time walking to each point. But there may be an increase in mimics if you get all of the objectives in one place.

Fourth: organise. I know it can be boring to sort out all of your goods in your place but when you have to find a specific ammo you will know where it is instead if digging through a pile.

Fifth: Don't spend all at once. Leave some cash left over in case of need for meds or food. Id say to keep at least 1500 on you just in case (depending on they difficulty setting).

First: Look out for anomalies. Probes and good eyesight will serve you well and the anomalies have taken enough of us as is. Most, if not all, Have some way to spot them out. They 'Push' anomaly, as i like to call it, has what appears to have an artefact on the ground. When i first saw it i walk over and fell for its trap. So don't make the same mistake i did.

Second: Choose your fights when possible. If it is hostile by all means kill it. But if it doesn't see you you have the choice to leave it be. After all The tide puts them back so why waste ammo? If you do try to take them out just make sure your odds of winning are good (Ammo check, med check, Position check, that stuff).

Third: Identify your enemy. If it is stronger than you are in terms of armour and sheer firepower you must ask yourself. Is it worth it? Can i win this? Am i fighting it for a reason? such as good or an objective.

Fourth: Use cover. If a mimic is shooting at use. Use cover so you don't get you head blown off. Is a spawn is harassing you. Use cover (like a tree) to get it stuck so you can get rid it quickly.

Fifth: Stock the safe-houses. The stuff inside them will not go away after a tide, like the facility.
If one day you get into a safe-house with you weapon broken and/or hungry, you will be thankful that you have stocked your safe-house with spare food and repair tools.

Six: When finding a distorted zone it may have lots of ash for quick cash. but do not go in unprotected or your lungs will burn. Bring the UNPSC distortion mask to stay safe in there. Be quick when in there for the mask will not last forever.

Seventh: don't touch the red water, or 'hell slime', for it seems to be corrosive. Normal water is safe but is not common to find. I wouldn't drink it though.

Eighth: Watch the tide. There is a counter of when the tide is inbound (It's shown in the tutorial) But it is crucial when going in the radius. Plan how long you will be in there for so you don't get caught in it. If you are run to a safe house. If it is inbound in like 5 minutes you can sleep until the end of it So when you wake up the tide will be over.

Means a'lot that someone will bother to read all of it even though it is wordy. But none the less: Thank you.