I have too much information to manage and I would like your advice on what software to use, please.
It is difficult to advise students on what software to use as it very much depends on what devices you are using and your IT skills. However, if you are feeling overwhelmed with the amount of information you have in different formats (web pages, notes, images, recordings etc),and you are finding it difficult to organise the information, Evernote may provide you with the facility to do this. This is just one of several products that is available and you are advised to try a few e.g. the app. Notability for instance. An IOE LibGuide for Evernote will help you get started - see: http://libguides.ioe.ac.uk/evernote
Note: Some of the features on Evernote require a subscription to Evernote Premium. The paid for features include a higher upload capatcity, the ability to search inside PDFs and attachments, enhanced collaborative working modes and a presentation mode to name a few. More information on Evernote Premium is available here. This post from the LSE's Impact of the Social Sciences blog is a useful starting point as it highlights the benefits of using this technology.
You may find that other alternatives such as Mendeley and Zotero both of which are are bibliographic management packages, may suffice if you are only collecting articles and references to books and book chapters. These packages allow you to store documents and to capture webpages.