Have you looked into mediation services? If you google your town/county and mediation, there will be a few pop up.
Depending upon STBEH’s willingness, mediation will help set a plan for formal separation and divorce in the future. The mediator meets with you both individually and then together to agree whatever needs agreeing, eg current living situation, short term finances, DC living arrangements / nights over, long term finances.
STBEH suggested this and I was reluctant at first but our mediator has been brilliant. She’s understood I’m not ready yet to progress divorce paperwork and just need a bit more time.
The process so far (we started it early, so only a month in) has helped me prepare and be practical in my thinking, for example I had a zoom with a mortgage advisor to see if I could stay in our family home (I can). I’ve also pulled my pension report and researched STBEH pension. I have gone through all outgoings (direct debits) cancelling non essential ones and moving my personal ones out of our joint account. Also set up my own account too, moved my wages into that one, not the joint.
When you say you don’t contribute much but can, I’d highly recommend getting your ducks in a row. Do a budget planner, current income and outgoings just on your own wages. List all your assets (equity in house, savings, pensions) and all your debt (mortgage, credit card, loans). In theory, starting point is 50/50 but it isn’t as straight forward as that. DC location over night is important in terms of how many nights per week/year in relation to Child Maintenance payments. If you’re equally sharing then it’s irrelevant (we’re doing 50/50 with DC).
I’m not suggesting don’t get a solicitor as I think it’s important you do, but don’t automatically assume you need one immediately. If STBEH agrees, mediation is a far cheaper route to divorce (I have seen a solicitor for an initial appointment but I’d seen the mediator first so had a lot of info to hand to take in with me and her advice was practical and helpful in relation to pensions which is/will be complex)