The 11+ is complicated but you've found this forum so you are halfway there.
Read the 'stickies' the first few discussions with a kind of splat symbol at the start of the Birmingham, Walsall, Wolverhampton and Wrekin region. The test specific content and the CEM preparation discussions are worth a careful read and occasional re-reads.
If it is all new and you're finding people difficult to talk to Bond does a lovely book called The Parents Guide to the 11+ - which explains a lot and has assessment tests for your child to help gauge if they're 11+ material.
I can't speak for everywhere in this region but in Birmingham tutoring is big business and some parents throw a lot of money at the 11+ campaign. We went DIY with 10 minute bonds (progressively working through age levels 9-10/ 10-11/ 11-12 in all 4 areas - VR/ English/NVR/ Maths, CGP CEM practice papers and 11+ essentials Cloze tests with my small fry from around March 2015 in run up to test sept 2015. Everyone seems to agree that reading quality fiction really helps - since vocabulary is key to success - good list of books here http://www.elevenplusexams.co.uk/advice/english/reading-list
My genuine advice is that the time and money you can spend on your 11+ campaign is along the lines of 'How long is a piece of string?' So best to do some real soul searching about your aspirations, your commitment to support this and will it be worth it if the result isn't enough to get in.
If you can talk to friends who,have been there and done that.
I had my eldest not succeed to get in for sept 2014 entry and small fry has just scraped it into CHG this year. So I've got a mixed track record - but I think if you embark on this as an education improvement initiative rather than an all out battle to get into X grammar school, it does seem to help keep things in perspective.
Whatever else there's no preparing you for the worry of results or offer day. Nor any consolation when it's a near miss. So have a deep search of your feelings before jumping into this - it isn't easy, it can be frustrating but also it can be very rewarding. Reading and working with my girls has been a real pleasure and I know it's going to take some adjusting now I'm retired.