Where to start ...

Daliah

If you have spare money that shouldn't be put towards your family's emergency fund(*), you should be looking at your pension provisions. I don't know how old/young you are, and retirement might be a long time away, but it takes a long time to build up a decent retirement fund. Think about what you will be living of once you are retired, work out how much you need to put into your pension fund.

My advice remains: do not even think about trading. It would more likely than not end in tears.

* your family's emergency fund should be at least 6 months worth of living expenses, and should be kept in an easy access account.

bostonerimus

Trading might start out as "fun", but it can quickly spiral into basically a gambling like addiction. DO NOT GO THERE!
Think about your own pension provision and maybe open a SIPP. Make sure you are getting all the benefits that you can and do a budget to see where savings can be made that you can them invest for the long term in a SIPP or an ISA.
Don't start with goals that seem out of sight. I would fund Junior SIPPs for your kids before a holiday to Florida.

Malthusian

Don't start with goals that seem out of sight. I would fund Junior SIPPs for your kids before a holiday to Florida.

Junior SIPPs should not be anywhere on the OP's priority list. They are intergenerational wealth transfer, and a very low-priority form of it at that. The OP doesn't have any money for intergenerational wealth transfer.

If at some point in the future they already have enough money to meet their own needs forever, and they already have enough money to give their kids whatever they feel appropriate towards university costs, weddings, house purchases, grandchildren, etc etc, then it might make sense to look at funding childrens' pensions.

Enjoying family holidays with your kids is more important than leaving funds for them to inherit, potentially years or even decades after the OP's death.