hi, hahaha don't worry I had a lot of questions before I started as well
My EPQ title was 'Should Huntington's Disease be treated more psychiatrically or neurologically?"
I didn't find analysing/evaluating sources too difficult because I had done a lot of it in history gcse, but my main tips are to consider the type of source, when it was written, who it was written by etc to decide if it is bias/reliable etc.
As for dealing with sources, I recommend creating a table with the following headers: source (use this column to cite source), source type, date accessed, quotes, notes (use this to summarise what the source is about so it's easier for you to remember later on) and evaluation (this is where you will discuss the reliability/usefulness etc. of the source) every time you find a source (whether you think it'll make it into your essay or not) cite the source and add it to the table. To be honest, I kind of did this but for some I didn't properly cite them or didn't evaluate them straight away which made it a very tiresome task at the end.
I ended up using 56 sources in my essay (some were from the same source but different parts of the journal for example). However in my source table I evaluated 60 sources and explained why i didn't include the 4 sources i didn't include that didn't make it into my essay. I would say more than how many sources you use it is more important to ensure you have a wide variety of sources, for example I had journals, articles, websites, a podcast and an interview I had carried out.
I first started thinking about my EPQ last summer after gcses and so by september I had my title. I started by doing a skeleton for my essay: intro, paragraph 1, 2, conclusion etc. Then I started researching my topic and when I found a source that I thought would be useful I copied and pasted the section I thought would be useful under the section I thought it would fit under. This way when I came to do my final plan everything I needed was in one place. My school also made us make a Gantt Chart, I never used mine but it does show that you are able to manage your time well and it gives you a good idea of the timeline you should follow.