Start off with accessing some of the amazing free learning resources available online.
If you haven't got a printer of your own then you can download information on to a drive pen, or email the worksheets, and ask a friend or relative to print it out for you.
Local libraries have free internet access, and their printing costs are very reasonable.
Below is a list of sites I have found useful.
I don't have any affiliation with any of them, and I don't get anything for linking to them.
Google for yourself and see what you come up with. If you find any sites particularly helpful then please contact me and I will have a browse myself, and perhaps add them to the list.
Some sites provide free resources but insist that you provide your contact details in order to access them. I tend to steer away from these, because there is so much free stuff out there that doesn't require you to give any personal information. Besides which, I already get enough spam in my inbox!
The links below include a mixture of very basic worksheets for beginners and more complex ideas for the more confident learner.
Punctuation worksheets this site is great as it has worksheets for all levels of ability, and you can start with the basics without your child knowing if they are working below the level set for their chronological age.
Proofreading worksheets proof reading is a great way of teaching your child to spot mistakes and how to rectify them. It's also useful that you can show them that other people make mistakes, and it is nothing to be worried about.
The BBC Skillswise site fact sheets and worksheets on all aspects of English and Maths.
PDF of 100 high frequency words lists of high frequency (ie: words that are used a lot!) words are extremely useful. You can use them to ensure that your child recognises the words when you read them out loud, and that your child can use them in a spoken sentence, and understands their meaning. As they become more confident you can set up spelling games; for example you could take five of the words and see if they can write them correctly. Progress to longer lists of words, and reward for each one spelt accurately. You can join in with the game too, and see who wins (there is nothing wrong with throwing a game in their favour, now and then ;) ).