You cannot really know how the numbers are going to play out, so you should be merely attempting to do your best with what you got and what you know, and the thing that you know most is your own current budget (especially how much money you currently have on hand), and then you should have a pretty good idea of the amount of pay that you have coming in, but it cannot necessarily be completely known until you actually get paid.  And, with your expenses, you probably know most of them, but you have some that come about from time to time or they change from time to time.

I think it can be good to at least think about all three categories of the way to invest (well 4 categories, if you think about making sure that your emergency fund is decently in place or being ongoingly built), and so sometimes you might be in circumstances in which you might not be able to employ all three circumstances, such as being able to employ the lump sum because you feel that you do not have enough of a lump sum to work with, and ultimately that is going to be up to you to figure out what would be the most comfortable of the balances of the 3/4 categories. 
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Thank you sir. From this I believe that having all three strategies at hand would even be more favourable to me, just incase the price soares then if I had lump sum a specific amount I would be at more advantage, and if it the price has reduced I shoul also have a reserve for buying dips if necessary. From what your implying, all strategies are good when you have a proper plan behind your accumulation and dca is just safe cause I won't have to worry about the market conditions or Current price, since I'm just investing specific amounts on intervals.
And I think I would catch up pretty fast cause I do have multiple sources of income, I won't like to share my total income for a month cause its mostly irregular cause I do have some mini investments going on with a forex group, but from your first paragraph it think your also telling me to make sure I remove some money for my upkeep, I'm still with my parents for now tho, so I think that is covered, the emergency fund, should i also remove a part of my income to cover up emergency, what kind of emergency are we talking about here?. For a start I think I can use two strategies, lump sum and dca since I can manage that for now, is it also possible I lump sum on dips, since its buying with a huge percentage of your capital each month, can I use lump sum in a way that i set it to buy at any dip that occurs in the market while I use dca to be on a safe side since the market is unpredictable? .