will red & blonde give me a strawberry blonde color?

Not unless you know how to mix the correct ratio. Besides, it's unnecessary. Available blonde shades range from dark blonde 7.0 to 10.0 lightest baby blonde. First select the shade. 10.6 would be light strawberry blonde, 8.6 medium strawberry blonde, etc. In order to select the correct shade you need to know your natural base colour. Tint only lifts 4 shades on virgin hair, 5 using high lift booster tints. So if your hair is jet black #1 the lightest shade you can achieve is 5.0 medium brown or 6.0 ginger with high lift tint. If you want to mix your own colour, only add 5 ml of red to the blonde mix and extra 2.5 ml of 10 v peroxide.