I use all this, full fox farm line-up +.
Once in final pot if using FFOF you will not need to fed for 2-4 weeks depending on strain and size of pots. Like topfuel29 said start following the Fox Farm schedule.
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If you need to begin to use nutes in veg start at the week of the actual plants life, if plant is say 35 days old count 7 days as the seedling phase and start at week 4 or however old your plant is minus 7 days and start at that week. If you don't need nutes until flower, this can happen if you transplant into bigger pots and final transplant is late in veg, then you wouldn't need to to begin feeding nutes until early flower. If not feeding until flower just start at how long you have been in flower. If 10 days in before you begin nutes start at week 6. And so on.
Here is a different pic of my large bottles and the smaller ones I use so I can measure easier. Notice the two molasses brands second from the left. One is Botanicare Strapped and the second is Earth Juice Hi-Brix, either works great as a molasses additive.
If you are using the blooming solubles trio(Open Sesame-Beatie Bloomz-Cha Ching) follow the chart as well. Never use over recommended doses and a good rule of thumb like topfuel said is use 1/2 strength at first or throughout. In future grows if you wish to experiment with higher doses use full amounts but never go over recommendations especially with tiger, grow and all three solubles. Big Bloom is weak but good and can be used throughout the entire grow at full strength.
With OCean Forest soil you should add dolomite lime at 1 TBSP per gallon of soil, Fox Farms does not put enough egg shells and dolomite in to help with cal-mag and pH issues so the lime really helps later in grow. Also grab cal-mag or a version of it. In first pic you can see cal-mag plus and the advanced nutrients version at the top right in the green and red bottles of same shape, behind those is the cal-mag.
As for adding nutes or any additives add each separately to water and mix, never mix nutes alone together without water. You can add in your nutes, molasses or whatever in any order, doesn't matter. No reason to use molasses in veg, wait until flower, especially if you decide to use Fox Farms Microbe and Kangaroots(bottom left middle in first pic).
Just use what you got and add to your line-up when you can. I first started with just FFOF and the three basics(big grow-big bloom-tiger bloom) and had good results. I have great results now after 2 years of experimenting. Good Luck!